config.txt: move stash.* 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

@@ -415,15 +415,7 @@ include::config/ssh.txt[]
 
 include::config/status.txt[]
 
-stash.showPatch::
-	If this is set to true, the `git stash show` command without an
-	option will show the stash entry in patch form.  Defaults to false.
-	See description of 'show' command in linkgit:git-stash[1].
-
-stash.showStat::
-	If this is set to true, the `git stash show` command without an
-	option will show diffstat of the stash entry.  Defaults to true.
-	See description of 'show' command in linkgit:git-stash[1].
+include::config/stash.txt[]
 
 include::submodule-config.txt[]
 

Documentation/config/stash.txt

@@ -0,0 +1,9 @@
+stash.showPatch::
+	If this is set to true, the `git stash show` command without an
+	option will show the stash entry in patch form.  Defaults to false.
+	See description of 'show' command in linkgit:git-stash[1].
+
+stash.showStat::
+	If this is set to true, the `git stash show` command without an
+	option will show diffstat of the stash entry.  Defaults to true.
+	See description of 'show' command in linkgit:git-stash[1].