Clarify that ${name} is required for replication.

The documentation now makes it clear that the ${name} wildcard is
required for gerrit to be able to match URLs to the projects that
it needs to replicate.

Bug: issue 896
Change-Id: I51a6ea29ced0b6bc782467692bfb22fe9a706207
Signed-off-by: Francois Marier <francois@debian.org>

Documentation/config-replication.txt

diff --git a/Documentation/config-replication.txt b/Documentation/config-replication.txt
index 1e20d2b..76b7fff 100644
--- a/Documentation/config-replication.txt
+++ b/Documentation/config-replication.txt
@@ -86,7 +86,9 @@
 +
 Within each URL value the magic placeholder `$\{name}` is replaced
 with the Gerrit project name.  This is a Gerrit specific extension
-to the otherwise standard Git URL syntax.
+to the otherwise standard Git URL syntax and it must be included
+in each URL so that Gerrit can figure out where each project needs
+to be replicated.
 +
 See link:http://www.kernel.org/pub/software/scm/git/docs/git-push.html#URLS[GIT URLS]
 for details on Git URL syntax.