Tweak fix

Author: ggailey777

articles/azure-functions/functions-scale.md

@@ -64,7 +64,7 @@ The following table shows operating system and [language support](supported-lang
 ## Scale
 
 The following table compares the scaling behaviors of the various hosting plans.  
-Maximum instances are an a per-function app (Consumption) or per-plan (Premium/Dedicated) basis, unless otherwise indicated. 
+Maximum instances are given on a per-function app (Consumption) or per-plan (Premium/Dedicated) basis, unless otherwise indicated. 
 
 | Plan | Scale out | Max # instances | 
 | --- | --- | --- |