Prolog cookbook typo; line should end with period, not comma

Change-Id: I73c28dc95d498d921f85d133dce6d69660f6bf01

Documentation/prolog-cookbook.txt

diff --git a/Documentation/prolog-cookbook.txt b/Documentation/prolog-cookbook.txt
index 6754eea..cced53e2 100644
--- a/Documentation/prolog-cookbook.txt
+++ b/Documentation/prolog-cookbook.txt
@@ -828,7 +828,7 @@
     N = label('Non-Author-Code-Review', need(_)).
 
 base(CR) :-
-    gerrit:max_with_block(-2, 2, 'Code-Review', CR),
+    gerrit:max_with_block(-2, 2, 'Code-Review', CR).
 ----
 
 === Example 11: Remove the `Verified` category from all projects