help: document the new [command-templates] config section
Differential Revision: https://phab.mercurial-scm.org/D9265
--- a/mercurial/helptext/config.txt Sun Nov 08 16:23:35 2020 -0500
+++ b/mercurial/helptext/config.txt Fri Oct 30 13:26:18 2020 -0700
@@ -2568,6 +2568,14 @@
Can be overridden per-merge-tool, see the ``[merge-tools]`` section.
+``oneline-summary``
+ A template used by `hg rebase` and other commands for showing a one-line
+ summary of a commit. If the template configured here is longer than one
+ line, then only the first line is used.
+
+ The template can be overridden per command by defining a template in
+ `oneline-summary.<command>`, where `<command>` can be e.g. "rebase".
+
``pre-merge-tool-output``
A template that is printed before executing an external merge tool. This can
be used to print out additional context that might be useful to have during