Bug 356074: make error for omitting "cf_" from a command name be grammatically correct.

r=LpSolit, a=jusdave

webtools/bugzilla/template/en/default/admin/custom_fields/create.html.tmpl

@@ -43,10 +43,11 @@
   and you just haven't enabled the correct feature yet.
 
   <ul>
-    <li>Custom field names must begin with "cf_" to distinguish them from standard
-        fields. If you omit "cf_" from the name, it will automatically be appended.</li>
-    <li>Descriptions are a very short string describing the field and will be used
-        as the label for this field in the user interface.</li>
+    <li>Custom field names must begin with "cf_" to distinguish them from
+        standard fields. If you omit "cf_" from the beginning of the name, it
+        will be added for you.</li>
+    <li>Descriptions are a very short string describing the field and will be
+        used as the label for this field in the user interface.</li>
   </ul>
   <br>
 </p>