fix git config example syntax

git-config expects a space, not '=' between option and value.

Also, quote the value since it contains globs, which some shells will not
pass through unchanged, or will abort if the glob doesn't expand.

Signed-off-by: Joey Hess <joey@kitenet.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/git-svn.txt

@@ -513,7 +513,7 @@ have each person clone that repository with 'git clone':
 	cd project
 	git-init
 	git remote add origin server:/pub/project
-	git config --add remote.origin.fetch=+refs/remotes/*:refs/remotes/*
+	git config --add remote.origin.fetch '+refs/remotes/*:refs/remotes/*'
 	git fetch
 # Initialize git-svn locally (be sure to use the same URL and -T/-b/-t options as were used on server)
 	git-svn init http://svn.foo.org/project