Documentation: mention config sources for @{upstream}

wking · gitster · commit 670a7297c2af · 2014-05-13T12:35:00.000-07:00
The earlier documentation made vague references to "is set to build
on".  Flesh that out with references to the config settings, so folks
can use git-config(1) to get more detail on what @{upstream} means.
For example, @{upstream} does not care about remote.pushdefault or
branch.&lt;name&gt;.pushremote.

Signed-off-by: W. Trevor King &lt;wking@tremily.us&gt;
Signed-off-by: Junio C Hamano &lt;gitster@pobox.com&gt;
diff --git a/Documentation/revisions.txt b/Documentation/revisions.txt
@@ -94,7 +94,9 @@ some output processing may assume ref names in UTF-8.
 '<branchname>@\{upstream\}', e.g. 'master@\{upstream\}', '@\{u\}'::
   The suffix '@\{upstream\}' to a branchname (short form '<branchname>@\{u\}')
   refers to the branch that the branch specified by branchname is set to build on
-  top of.  A missing branchname defaults to the current one.
+  top of (configured with `branch.<name>.remote` and
+  `branch.<name>.merge`).  A missing branchname defaults to the
+  current one.
 
 '<rev>{caret}', e.g. 'HEAD{caret}, v1.5.1{caret}0'::
   A suffix '{caret}' to a revision parameter means the first parent of
