Fix link in documentation of user roles

The link must use the AsciiDoc format, not the Markdown format.

Signed-off-by: Edwin Kempin <ekempin@google.com>
Change-Id: I6d87d0ad8512e19379359f7bb0dfa1493c1255bb
diff --git a/Documentation/intro-user.txt b/Documentation/intro-user.txt
index 3aeeccb..2c9c147 100644
--- a/Documentation/intro-user.txt
+++ b/Documentation/intro-user.txt
@@ -710,9 +710,10 @@
 The uploader of the first patch set is the change owner.
 +
 The uploader of the latest patch set, the user that uploaded the
-current patch set, is relevant when [self approvals on labels are
-ignored](config-labels.html#label_ignoreSelfApproval), as in this case
-approvals from the uploader of the latest patch set are ignored.
+current patch set, is relevant when
+link:config-labels.html#label_ignoreSelfApproval[self approvals on labels are
+ignored], as in this case approvals from the uploader of the latest patch set
+are ignored.
 
 - Change Owner:
 +