pull doc: refer to a specific section in 'fetch' doc

The documentation for the `<refspec>` parameter in the `git fetch`
documentation refers to the section "CONFIGURED REMOTE-TRACKING
BRANCHES" in this same documentation page.

In the `git pull` documentation, let's also refer specifically to this
section instead of just linking to the `git fetch` documentation.

Signed-off-by: Philippe Blain <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: phil-blain

Documentation/pull-fetch-param.txt

@@ -19,7 +19,8 @@ ifndef::git-pull[]
 	(see <<CRTB,CONFIGURED REMOTE-TRACKING BRANCHES>> below).
 endif::git-pull[]
 ifdef::git-pull[]
-	(see linkgit:git-fetch[1]).
+	(see the section "CONFIGURED REMOTE-TRACKING BRANCHES"
+	in linkgit:git-fetch[1]).
 endif::git-pull[]
 +
 The format of a <refspec> parameter is an optional plus