Fix grammar in section title

jmikola · kay-kim · commit bc28b9bab0e8 · 2018-01-29T14:08:15.000-05:00
diff --git a/source/reference/command/update.txt b/source/reference/command/update.txt
@@ -257,8 +257,8 @@ option:
 
 .. _update-command-arrayFilters:
 
-Specify ``arrayFilters`` for an Array Update Operations
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+Specify ``arrayFilters`` for Array Update Operations
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 .. include:: /includes/extracts/arrayFilters-blurb.rst
 
