Update whatsnew instructions for GitHub (python#98124)

Author: carljm

Doc/whatsnew/3.12.rst

@@ -37,11 +37,11 @@
    * Credit the author of a patch or bugfix.   Just the name is
    sufficient; the e-mail address isn't necessary.
 
-   * It's helpful to add the bug/patch number as a comment:
+   * It's helpful to add the issue number as a comment:
 
    XXX Describe the transmogrify() function added to the socket
    module.
-   (Contributed by P.Y. Developer in :issue:`12345`.)
+   (Contributed by P.Y. Developer in :gh:`12345`.)
 
    This saves the maintainer the effort of going through the VCS log when
    researching a change.