format fix.

Author: rouilj

doc/rest.txt

@@ -1861,7 +1861,7 @@ your company's single sign on infrastructure.
 
 So what we need is a way for this third party service to impersonate
 you and have access to create a roundup timelog entry (see
-`<customizing.html#adding-a-time-log-to-your-issues>`__ ). Then add it
+`<customizing.html#adding-a-time-log-to-your-issues>`_). Then add it
 to the associated issue. This should happen without sharing passwords
 and without allowing the third party service to see the issue (except the
 ``times`` property), user, or other information in the tracker.