Merge branch 'mm/am-c-doc' into maint

The configuration variable 'mailinfo.scissors' was hard to
discover in the documentation.

* mm/am-c-doc:
  Documentation/git-am.txt: mention mailinfo.scissors config variable
  Documentation/config.txt: document mailinfo.scissors

Author: gitster

Documentation/config.txt

@@ -1739,6 +1739,13 @@ log.mailmap::
 	If true, makes linkgit:git-log[1], linkgit:git-show[1], and
 	linkgit:git-whatchanged[1] assume `--use-mailmap`.
 
+mailinfo.scissors::
+	If true, makes linkgit:git-mailinfo[1] (and therefore
+	linkgit:git-am[1]) act by default as if the --scissors option
+	was provided on the command-line. When active, this features
+	removes everything from the message body before a scissors
+	line (i.e. consisting mainly of ">8", "8<" and "-").
+
 mailmap.file::
 	The location of an augmenting mailmap file. The default
 	mailmap, located in the root of the repository, is loaded

Documentation/git-am.txt

@@ -52,7 +52,8 @@ OPTIONS
 -c::
 --scissors::
 	Remove everything in body before a scissors line (see
-	linkgit:git-mailinfo[1]).
+	linkgit:git-mailinfo[1]). Can be activated by default using
+	the `mailinfo.scissors` configuration variable.
 
 --no-scissors::
 	Ignore scissors lines (see linkgit:git-mailinfo[1]).