docs: document the scriv.user_nick git setting.

changelog.d/20231003_082812_ronny_user_nick_setting.rst

@@ -1,10 +1,9 @@
-
 Added
 .....
 
-- consider the git config ``scriv.user_nick`` for the user nick part
-  of the fragment file - thanks to `Ronny Pfannschmidt <pull 106>`_, fixing `issue 103`_
-
+- Use the git config ``scriv.user_nick`` for the user nick part
+  of the fragment file. Thanks to `Ronny Pfannschmidt <pull 106>`_,
+  fixing `issue 103`_.
 
 .. _issue 103: https://github.com/nedbat/scriv/pull/103
 .. _pull 106: https://github.com/nedbat/scriv/pull/106

docs/configuration.rst

@@ -378,6 +378,9 @@ Per-User Git Settings
 Some aspects of scriv's behavior are configurable for each user rather than for
 the project as a whole.  These settings are read from git.
 
+Editing and Adding
+------------------
+
 These settings determine whether the ":ref:`cmd_create`" and
 ":ref:`cmd_collect`" commands will launch an editor, and "git add" the result:
 
@@ -395,6 +398,13 @@ or globally for all of your repos::
 
     $ git config --global scriv.create.edit true
 
+User nickname
+-------------
+
+Scriv includes your git or GitHub username in the file names of changelog
+fragments you create.  If you don't like the name it finds for you, you can set
+a name as the ``scriv.user_nick`` git setting.
+
 
 .. _git config: https://git-scm.com/book/en/v2/Customizing-Git-Git-Configuration