Minor fixes to C API docs (GH-31501)

* C API docs: move PyErr_SetImportErrorSubclass docs

It was in the section about warnings, but it makes more sense to
put it with PyErr_SetImportError.

* C API docs: document closeit argument to PyRun_AnyFileExFlags

It was already documented for PyRun_SimpleFileExFlags.

* textual fixes to unicode docs

* Move paragraph about tp_dealloc into tp_dealloc section

* __aiter__ returns an async iterator, not an awaitable

Doc/c-api/exceptions.rst

@@ -253,6 +253,14 @@ For convenience, some of these functions will always return a
    .. versionadded:: 3.3
 
 
+.. c:function:: PyObject* PyErr_SetImportErrorSubclass(PyObject *exception, PyObject *msg, PyObject *name, PyObject *path)
+
+   Much like :c:func:`PyErr_SetImportError` but this function allows for
+   specifying a subclass of :exc:`ImportError` to raise.
+
+   .. versionadded:: 3.6
+
+
 .. c:function:: void PyErr_SyntaxLocationObject(PyObject *filename, int lineno, int col_offset)
 
    Set file, line, and offset information for the current exception.  If the
@@ -320,13 +328,6 @@ an error value).
    :mod:`warnings` module and the :option:`-W` option in the command line
    documentation.  There is no C API for warning control.
 
-.. c:function:: PyObject* PyErr_SetImportErrorSubclass(PyObject *exception, PyObject *msg, PyObject *name, PyObject *path)
-
-   Much like :c:func:`PyErr_SetImportError` but this function allows for
-   specifying a subclass of :exc:`ImportError` to raise.
-
-   .. versionadded:: 3.6
-
 
 .. c:function:: int PyErr_WarnExplicitObject(PyObject *category, PyObject *message, PyObject *filename, int lineno, PyObject *module, PyObject *registry)
 

Doc/c-api/typeobj.rst

@@ -476,7 +476,7 @@ PyObject Slots
 --------------
 
 The type object structure extends the :c:type:`PyVarObject` structure. The
-:attr:`ob_size` field is used for dynamic types (created by  :func:`type_new`,
+:attr:`ob_size` field is used for dynamic types (created by :func:`type_new`,
 usually called from a class statement). Note that :c:data:`PyType_Type` (the
 metatype) initializes :c:member:`~PyTypeObject.tp_itemsize`, which means that its instances (i.e.
 type objects) *must* have the :attr:`ob_size` field.
@@ -2000,6 +2000,17 @@ and :c:type:`PyType_Type` effectively act as defaults.)
    For this field to be taken into account (even through inheritance),
    you must also set the :const:`Py_TPFLAGS_HAVE_FINALIZE` flags bit.
 
+   Also, note that, in a garbage collected Python,
+   :c:member:`~PyTypeObject.tp_dealloc` may be called from
+   any Python thread, not just the thread which created the object (if the object
+   becomes part of a refcount cycle, that cycle might be collected by a garbage
+   collection on any thread).  This is not a problem for Python API calls, since
+   the thread on which tp_dealloc is called will own the Global Interpreter Lock
+   (GIL). However, if the object being destroyed in turn destroys objects from some
+   other C or C++ library, care should be taken to ensure that destroying those
+   objects on the thread which called tp_dealloc will not violate any assumptions
+   of the library.
+
    **Inheritance:**
 
    This field is inherited by subtypes.
@@ -2024,17 +2035,6 @@ and :c:type:`PyType_Type` effectively act as defaults.)
    .. versionadded:: 3.9 (the field exists since 3.8 but it's only used since 3.9)
 
 
-Also, note that, in a garbage collected Python, :c:member:`~PyTypeObject.tp_dealloc` may be called from
-any Python thread, not just the thread which created the object (if the object
-becomes part of a refcount cycle, that cycle might be collected by a garbage
-collection on any thread).  This is not a problem for Python API calls, since
-the thread on which tp_dealloc is called will own the Global Interpreter Lock
-(GIL). However, if the object being destroyed in turn destroys objects from some
-other C or C++ library, care should be taken to ensure that destroying those
-objects on the thread which called tp_dealloc will not violate any assumptions
-of the library.
-
-
 .. _static-types:
 
 Static Types
@@ -2440,7 +2440,8 @@ Async Object Structures
 
       PyObject *am_aiter(PyObject *self);
 
-   Must return an :term:`awaitable` object.  See :meth:`__anext__` for details.
+   Must return an :term:`asynchronous iterator` object.
+   See :meth:`__anext__` for details.
 
    This slot may be set to ``NULL`` if an object does not implement
    asynchronous iteration protocol.

Doc/c-api/unicode.rst

@@ -1003,7 +1003,7 @@ Error handling is set by errors which may also be set to ``NULL`` meaning to use
 the default handling defined for the codec.  Default error handling for all
 built-in codecs is "strict" (:exc:`ValueError` is raised).
 
-The codecs all use a similar interface.  Only deviation from the following
+The codecs all use a similar interface.  Only deviations from the following
 generic ones are documented for simplicity.
 
 
@@ -1171,7 +1171,7 @@ These are the UTF-16 codec APIs:
    ``1``, any byte order mark is copied to the output (where it will result in
    either a ``\ufeff`` or a ``\ufffe`` character).
 
-   After completion, *\*byteorder* is set to the current byte order at the end
+   After completion, ``*byteorder`` is set to the current byte order at the end
    of input data.
 
    If *byteorder* is ``NULL``, the codec starts in native order mode.
@@ -1302,7 +1302,7 @@ Character Map Codecs
 
 This codec is special in that it can be used to implement many different codecs
 (and this is in fact what was done to obtain most of the standard codecs
-included in the :mod:`encodings` package). The codec uses mapping to encode and
+included in the :mod:`encodings` package). The codec uses mappings to encode and
 decode characters.  The mapping objects provided must support the
 :meth:`__getitem__` mapping interface; dictionaries and sequences work well.
 
@@ -1426,7 +1426,7 @@ They all return ``NULL`` or ``-1`` if an exception occurs.
 .. c:function:: PyObject* PyUnicode_Splitlines(PyObject *s, int keepend)
 
    Split a Unicode string at line breaks, returning a list of Unicode strings.
-   CRLF is considered to be one line break.  If *keepend* is ``0``, the Line break
+   CRLF is considered to be one line break.  If *keepend* is ``0``, the line break
    characters are not included in the resulting strings.
 
 

Doc/c-api/veryhigh.rst

@@ -75,6 +75,8 @@ the same library that the Python runtime is using.
    :c:func:`PyRun_SimpleFile`.  *filename* is decoded from the filesystem
    encoding (:func:`sys.getfilesystemencoding`).  If *filename* is ``NULL``, this
    function uses ``"???"`` as the filename.
+   If *closeit* is true, the file is closed before
+   ``PyRun_SimpleFileExFlags()`` returns.
 
 
 .. c:function:: int PyRun_SimpleString(const char *command)