Merge pull request #25 from Agrosis/master

fix punctuation and more clear word usage

Author: leebyron

Section 6 -- Execution.md

@@ -1,10 +1,10 @@
 # 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
 
-To evaluate a request, the executor will have a parsed `Document` (as defined
+To evaluate a request, the executor must have a parsed `Document` (as defined
 in the “Query Language” part of this spec) and a selected operation name to
 run.