config.txt: move remotes.* to a separate file

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/config.txt

@@ -395,9 +395,7 @@ include::config/receive.txt[]
 
 include::config/remote.txt[]
 
-remotes.<group>::
-	The list of remotes which are fetched by "git remote update
-	<group>".  See linkgit:git-remote[1].
+include::config/remotes.txt[]
 
 repack.useDeltaBaseOffset::
 	By default, linkgit:git-repack[1] creates packs that use

Documentation/config/remotes.txt

@@ -0,0 +1,3 @@
+remotes.<group>::
+	The list of remotes which are fetched by "git remote update
+	<group>".  See linkgit:git-remote[1].