Rename expert labels to topic labels (#1076)

* Rename expert labels to topic labels

* Alphabetise sections

* Update wording

Co-authored-by: C.A.M. Gerlach <[email protected]>

* Add reST target for 'Topic labels'

---------

Co-authored-by: C.A.M. Gerlach <[email protected]>

Author: hugovk

triage/labels.rst

@@ -54,29 +54,31 @@ These labels are mostly used to specify which :ref:`part of the codebase
   (written in Python) and other changes related to tests, :mod:`unittest`,
   or :mod:`doctest`.
 
+OS labels
+=========
 
-Expert labels
-=============
+These labels are used to specify which operating systems are affected.
+Since most issues either affect all systems or are specific to Unix,
+the only available labels are :gh-label:`OS-windows`, :gh-label:`OS-mac`,
+and :gh-label:`OS-freebsd`.
+
+
+.. _Expert labels:
+.. _Topic labels:
+
+Topic labels
+============
 
-These labels are used to specify the area of expertise required to address
+These labels are used to denote the specific topic area, if any, of
 the issue/PR.  This includes both specific modules/packages and generic
 interest areas.
 
 Adding these labels is also a way to notify the relevant experts, since
 they are encouraged to subscribe to them.  Depending on the label,
 this might also automatically add the issue to a GitHub project.
 
-You can see the `full list of expert labels on GitHub
-<https://github.com/python/cpython/labels?q=expert>`_.
-
-
-OS labels
-=========
-
-These labels are used to specify which operating systems are affected.
-Since most issues either affect all systems or are specific to Unix,
-the only available labels are :gh-label:`OS-windows`, :gh-label:`OS-mac`,
-and :gh-label:`OS-freebsd`.
+You can see the `full list of topic labels on GitHub
+<https://github.com/python/cpython/labels?q=topic>`_.
 
 
 Version labels