Closes 21048: Index 'as' in import and with statements.

Doc/reference/compound_stmts.rst

@@ -331,7 +331,9 @@ may be found in section :ref:`raise`.
 The :keyword:`with` statement
 =============================
 
-.. index:: statement: with
+.. index::
+    statement: with
+    single: as; with statement
 
 .. versionadded:: 2.5
 

Doc/reference/simple_stmts.rst

@@ -653,6 +653,7 @@ The :keyword:`import` statement
    single: module; importing
    pair: name; binding
    keyword: from
+   single: as; import statement
 
 .. productionlist::
    import_stmt: "import" `module` ["as" `name`] ( "," `module` ["as" `name`] )*