fix up some comments in NEWS file

NEWS

@@ -3,11 +3,14 @@ release/005.001 (2016-12-11)
     Add "path" attributes to several exec resources. This will be required
     in the next version of Puppet. [adamhl]
 
-    [puppetclient] Replace "local" variables with what is really intended:
-    instance variables defined in the calling manifest (or defiend as a
-    Puppet fact). While not strictly necessary right now, in a future
-    version of Puppet will stop interpreting ERB local variables as
-    instance variables so we might as well fix them now. [adamhl]
+    [puppetclient] Replace "local" variables in ERB templates with what is
+    really intended: instance variables defined in the calling manifest
+    (or defined as a Puppet fact). While currently not strictly necessary,
+    in a future version Puppet will stop interpreting ERB local variables
+    as instance variables, so we might as well fix them now. Furthermore,
+    when using "puppet apply" incorrect use of variables in templates
+    generates ugly red warnings, so fixing these now makes "puppet apply"
+    happier. [adamhl]
 
     [puppetclient] Remove some conditional code that made sense when we
     used very old versions of Puppet. [adamhl]