Always use "section" when referring to sections of a document, not "Section".

Doc/ext/ext.tex

@@ -493,16 +493,16 @@ my_set_callback(dummy, arg)
 \end{verbatim}
 
 This function must be registered with the interpreter using the
-\constant{METH_VARARGS} flag; this is described in Section
+\constant{METH_VARARGS} flag; this is described in section
 \ref{methodTable}, ``The Module's Method Table and Initialization
 Function.''  The \cfunction{PyArg_ParseTuple()} function and its
-arguments are documented in Section \ref{parseTuple}, ``Format Strings
+arguments are documented in section \ref{parseTuple}, ``Format Strings
 for \cfunction{PyArg_ParseTuple()}.''
 
 The macros \cfunction{Py_XINCREF()} and \cfunction{Py_XDECREF()}
 increment/decrement the reference count of an object and are safe in
 the presence of \NULL{} pointers (but note that \var{temp} will not be 
-\NULL{} in this context).  More info on them in Section
+\NULL{} in this context).  More info on them in section
 \ref{refcounts}, ``Reference Counts.''
 
 Later, when it is time to call the function, you call the C function

Doc/lib/libfm.tex

@@ -10,7 +10,7 @@ This module provides access to the IRIS \emph{Font Manager} library.
 \index{Font Manager, IRIS}
 \index{IRIS Font Manager}
 It is available only on Silicon Graphics machines.
-See also: \emph{4Sight User's Guide}, Section 1, Chapter 5: ``Using
+See also: \emph{4Sight User's Guide}, section 1, chapter 5: ``Using
 the IRIS Font Manager.''
 
 This is not yet a full interface to the IRIS Font Manager.

Doc/lib/libstdtypes.tex

@@ -714,7 +714,7 @@ It is written as \code{Ellipsis}.
 
 File objects are implemented using \C{}'s \code{stdio}
 package and can be created with the built-in function
-\function{open()}\bifuncindex{open} described Section
+\function{open()}\bifuncindex{open} described section
 \ref{built-in-funcs}, ``Built-in Functions.''  They are also returned
 by some other built-in functions and methods, e.g.,
 \function{posix.popen()} and \function{posix.fdopen()} and the