add period.

Muhtasim Ahsan · Muhtasim Ahsan · commit ebd5462b2b90 · 2015-07-04T14:25:30.000-05:00
diff --git a/Section 6 -- Execution.md b/Section 6 -- Execution.md
@@ -1,6 +1,6 @@
 # Execution
 
-This section describes how GraphQL generates a response from a request
+This section describes how GraphQL generates a response from a request.
 
 ## Evaluating requests
 
