Merge branch 'maint'

* maint:
  Documentation: update description of shell aliases

Documentation/config.txt

@@ -456,7 +456,9 @@ If the alias expansion is prefixed with an exclamation point,
 it will be treated as a shell command.  For example, defining
 "alias.new = !gitk --all --not ORIG_HEAD", the invocation
 "git new" is equivalent to running the shell command
-"gitk --all --not ORIG_HEAD".
+"gitk --all --not ORIG_HEAD".  Note that shell commands will be
+executed from the top-level directory of a repository, which may
+not necessarily be the current directory.
 
 apply.whitespace::
 	Tells 'git-apply' how to handle whitespaces, in the same way