Setup guide: Mention that the path expression syntax can be configured

Signed-off-by: Edwin Kempin <ekempin@google.com>
Change-Id: Icdecdb5de5e1a70352b151b6ae5d1579ec41d6a3
diff --git a/resources/Documentation/setup-guide.md b/resources/Documentation/setup-guide.md
index cdf957d..63aa7e0 100644
--- a/resources/Documentation/setup-guide.md
+++ b/resources/Documentation/setup-guide.md
@@ -346,6 +346,9 @@
   approvals](config.html#pluginCodeOwnersExemptPureReverts).
 * [Users that are exempted from requiring code owner
   approvals](config.html#pluginCodeOwnersExemptedUser)
+* [configure](config.html#pluginCodeOwnersPathExpressions) a different syntax
+  for [path expressions](path-expressions.html) in code owner config files (e.g.
+  use plain globs)
 
 ### <a id="stopUsingFindOwners">9.Stop using the find-owners Prolog submit rule