doc: mention `git -c` in git-config(1)

Signed-off-by: David Glasser <glasser@davidglasser.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>

David Glasser committed Aug 23, 2016 at 10:33 UTC ae1f7094f7a68fcff3d07358d83f5f483f0c300c
1 file changed +3
Documentation/git-config.txt
+3
@@ -263,6 +263,9 @@ The files are read in the order given above, with last value found taking
263 precedence over values read earlier. When multiple values are taken then all
264 values of a key from all files will be used.
265
266 +You may override individual configuration parameters when running any git
267 +command by using the `-c` option. See linkgit:git[1] for details.
268 +
269 All writing options will per default write to the repository specific
270 configuration file. Note that this also affects options like '--replace-all'
271 and '--unset'. *'git config' will only ever change one file at a time*.