Merge branch 'jn/ignore-doc'

Explicitly list $HOME/.config/git/ignore as one of the places you
can use to keep ignore patterns that depend on your personal choice
of tools, e.g. *~ for Emacs users.

* jn/ignore-doc:
  gitignore doc: add global gitignore to synopsis

Documentation/gitignore.txt

@@ -7,7 +7,7 @@ gitignore - Specifies intentionally untracked files to ignore
 
 SYNOPSIS
 --------
-$GIT_DIR/info/exclude, .gitignore
+$HOME/.config/git/ignore, $GIT_DIR/info/exclude, .gitignore
 
 DESCRIPTION
 -----------