Replace PEP references with PUG links (#750)

docs/markers.rst

@@ -5,7 +5,8 @@ Markers
 
 One extra requirement of dealing with dependencies is the ability to specify
 if it is required depending on the operating system or Python version in use.
-`PEP 508`_ defines the scheme which has been implemented by this module.
+The :ref:`specification of dependency specifiers <pypug:dependency-specifiers>`
+defines the scheme which has been implemented by this module.
 
 Usage
 -----
@@ -51,7 +52,7 @@ Reference
 
     This class abstracts handling markers for dependencies of a project. It can
     be passed a single marker or multiple markers that are ANDed or ORed
-    together. Each marker will be parsed according to PEP 508.
+    together. Each marker will be parsed according to the specification.
 
     :param str markers: The string representation of a marker or markers.
     :raises InvalidMarker: If the given ``markers`` are not parseable, then
@@ -63,28 +64,29 @@ Reference
 
     :param dict environment: A dictionary containing keys and values to
                              override the detected environment.
-    :raises: UndefinedComparison: If the marker uses a PEP 440 comparison on
-                                  strings which are not valid PEP 440 versions.
+    :raises: UndefinedComparison: If the marker uses a comparison on strings
+                                  which are not valid versions per the
+                                  :ref:`specification of version specifiers
+                                  <pypug:version-specifiers>`.
     :raises: UndefinedEnvironmentName: If the marker accesses a value that
                                        isn't present inside of the environment
                                        dictionary.
 
 .. exception:: InvalidMarker
 
     Raised when attempting to create a :class:`Marker` with a string that
-    does not conform to PEP 508.
+    does not conform to the specification.
 
 
 .. exception:: UndefinedComparison
 
-    Raised when attempting to evaluate a :class:`Marker` with a PEP 440
-    comparison operator against values that are not valid PEP 440 versions.
+    Raised when attempting to evaluate a :class:`Marker` with a
+    comparison operator against values that are not valid
+    versions per the :ref:`specification of version specifiers
+    <pypug:version-specifiers>`.
 
 
 .. exception:: UndefinedEnvironmentName
 
     Raised when attempting to evaluate a :class:`Marker` with a value that is
     missing from the evaluation environment.
-
-
-.. _`PEP 508`: https://www.python.org/dev/peps/pep-0508/

docs/requirements.rst

@@ -4,8 +4,9 @@ Requirements
 .. currentmodule:: packaging.requirements
 
 Parse a given requirements line for specifying dependencies of a Python
-project, using `PEP 508`_ which defines the scheme that has been implemented
-by this module.
+project, using the :ref:`specification of dependency specifiers
+<pypug:dependency-specifiers>`, which defines the scheme that has been
+implemented by this module.
 
 Usage
 -----
@@ -60,8 +61,8 @@ Usage
 
     When a requirement is specified with a URL, the :class:`Requirement` class
     used to check the URL and reject values containing invalid scheme and
-    netloc combinations. This is no longer performed since PEP 508 does not
-    specify such rules, and the check incorrectly disallows valid requirement
+    netloc combinations. This is no longer performed since the specification does
+    not have such rules, and the check incorrectly disallows valid requirement
     strings from being parsed.
 
 Reference
@@ -70,7 +71,7 @@ Reference
 .. class:: Requirement(requirement)
 
     This class abstracts handling the details of a requirement for a project.
-    Each requirement will be parsed according to PEP 508.
+    Each requirement will be parsed according to the specification.
 
     :param str requirement: The string representation of a requirement.
     :raises InvalidRequirement: If the given ``requirement`` is not parseable,
@@ -99,6 +100,4 @@ Reference
 .. exception:: InvalidRequirement
 
     Raised when attempting to create a :class:`Requirement` with a string that
-    does not conform to PEP 508.
-
-.. _`PEP 508`: https://www.python.org/dev/peps/pep-0508/
+    does not conform to the specification.

docs/utils.rst

@@ -85,7 +85,8 @@ Reference
 
     :param str filename: The name of the wheel file.
     :raises InvalidWheelFilename: If the filename in question
-        does not follow conventions outlined in `PEP 427`_.
+        does not follow the :ref:`wheel specification
+        <pypug:binary-distribution-format>`.
 
     .. doctest::
 
@@ -137,4 +138,3 @@ Reference
     Raised when a source distribution file name is considered invalid.
 
 .. _Source distribution format: https://packaging.python.org/specifications/source-distribution-format/#source-distribution-file-name
-.. _`PEP 427`: https://peps.python.org/pep-0427/#file-name-convention