gh-101100: Fix Sphinx reference warnings (GH-112416)

* Fix Sphinx warning in library/xml.rst

Direct use of the pyexpat module is deprecated, but this is how to check the version for security purposes

* Fix Sphinx warning in library/importlib.resources.rst

* Use italics for parameters

* Link to the exception

* Fix Sphinx warning in library/gzip.rst

* Document message and header defect base classes to fix Sphinx warning in library/email.headerregistry.rst

* Restore feed_eof() doc to fix Sphinx warning in library/asyncio-stream.rst

* Fix Sphinx warning in extending/newtypes.rst

* Fix Sphinx warning in c-api/set.rst

On stdtypes.rst, set and frozenset are documented together and the frozenset has the working refs

5 files changed, 21 insertions, 8 deletions

diff --git a/Doc/library/asyncio-stream.rst b/Doc/library/asyncio-stream.rst
index d8186b6..0736e78 100644
--- a/Doc/library/asyncio-stream.rst
+++ b/Doc/library/asyncio-stream.rst
@@ -204,6 +204,10 @@ StreamReader
    directly; use :func:`open_connection` and :func:`start_server`
    instead.
 
+   .. method:: feed_eof()
+
+      Acknowledge the EOF.
+
    .. coroutinemethod:: read(n=-1)
 
       Read up to *n* bytes from the stream.
diff --git a/Doc/library/email.errors.rst b/Doc/library/email.errors.rst
index 194a986..56aea65 100644
--- a/Doc/library/email.errors.rst
+++ b/Doc/library/email.errors.rst
@@ -58,6 +58,15 @@ The following exception classes are defined in the :mod:`email.errors` module:
    :class:`~email.mime.nonmultipart.MIMENonMultipart` (e.g.
    :class:`~email.mime.image.MIMEImage`).
 
+.. exception:: MessageDefect()
+
+   This is the base class for all defects found when parsing email messages.
+   It is derived from :exc:`ValueError`.
+
+.. exception:: HeaderDefect()
+
+   This is the base class for all defects found when parsing email headers.
+   It is derived from :exc:`MessageDefect`.
 
 Here is the list of the defects that the :class:`~email.parser.FeedParser`
 can find while parsing messages.  Note that the defects are added to the message
diff --git a/Doc/library/gzip.rst b/Doc/library/gzip.rst
index f931d0e..50cde09 100644
--- a/Doc/library/gzip.rst
+++ b/Doc/library/gzip.rst
@@ -105,7 +105,7 @@ The module defines the following items:
    should only be provided in compression mode.  If omitted or ``None``, the
    current time is used.  See the :attr:`mtime` attribute for more details.
 
-   Calling a :class:`GzipFile` object's :meth:`close` method does not close
+   Calling a :class:`GzipFile` object's :meth:`!close` method does not close
    *fileobj*, since you might wish to append more material after the compressed
    data.  This also allows you to pass an :class:`io.BytesIO` object opened for
    writing as *fileobj*, and retrieve the resulting memory buffer using the
diff --git a/Doc/library/importlib.resources.rst b/Doc/library/importlib.resources.rst
index 3de97e8..a5adf0b 100644
--- a/Doc/library/importlib.resources.rst
+++ b/Doc/library/importlib.resources.rst
@@ -50,7 +50,7 @@ for example, a package and its resources can be imported from a zip file using
 ``get_resource_reader(fullname)`` method as specified by
 :class:`importlib.resources.abc.ResourceReader`.
 
-.. data:: Anchor
+.. class:: Anchor
 
     Represents an anchor for resources, either a :class:`module object
     <types.ModuleType>` or a module name as a string. Defined as
@@ -63,7 +63,7 @@ for example, a package and its resources can be imported from a zip file using
     (think files). A Traversable may contain other containers (think
     subdirectories).
 
-    *anchor* is an optional :data:`Anchor`. If the anchor is a
+    *anchor* is an optional :class:`Anchor`. If the anchor is a
     package, resources are resolved from that package. If a module,
     resources are resolved adjacent to that module (in the same package
     or the package root). If the anchor is omitted, the caller's module
@@ -72,10 +72,10 @@ for example, a package and its resources can be imported from a zip file using
     .. versionadded:: 3.9
 
     .. versionchanged:: 3.12
-       "package" parameter was renamed to "anchor". "anchor" can now
+       *package* parameter was renamed to *anchor*. *anchor* can now
        be a non-package module and if omitted will default to the caller's
-       module. "package" is still accepted for compatibility but will raise
-       a DeprecationWarning. Consider passing the anchor positionally or
+       module. *package* is still accepted for compatibility but will raise
+       a :exc:`DeprecationWarning`. Consider passing the anchor positionally or
        using ``importlib_resources >= 5.10`` for a compatible interface
        on older Pythons.
 
@@ -96,4 +96,4 @@ for example, a package and its resources can be imported from a zip file using
     .. versionadded:: 3.9
 
     .. versionchanged:: 3.12
-       Added support for ``traversable`` representing a directory.
+       Added support for *traversable* representing a directory.
diff --git a/Doc/library/xml.rst b/Doc/library/xml.rst
index 1e49b65..909022e 100644
--- a/Doc/library/xml.rst
+++ b/Doc/library/xml.rst
@@ -73,7 +73,7 @@ decompression bomb         Safe                Safe                Safe
 1. Expat 2.4.1 and newer is not vulnerable to the "billion laughs" and
    "quadratic blowup" vulnerabilities. Items still listed as vulnerable due to
    potential reliance on system-provided libraries. Check
-   :const:`pyexpat.EXPAT_VERSION`.
+   :const:`!pyexpat.EXPAT_VERSION`.
 2. :mod:`xml.etree.ElementTree` doesn't expand external entities and raises a
    :exc:`~xml.etree.ElementTree.ParseError` when an entity occurs.
 3. :mod:`xml.dom.minidom` doesn't expand external entities and simply returns