docs(error/badcfg): add missing "but"

Sentence meaning was unclear; added what I assumed should have been a "but"

Closes angular#10473

Author: jkingsman

docs/content/error/$resource/badcfg.ngdoc

@@ -3,7 +3,7 @@
 @fullName Response does not match configured parameter
 @description
 
-This error occurs when the {@link ngResource.$resource `$resource`} service expects a response that can be deserialized as an array, receives an object, or vice versa.
+This error occurs when the {@link ngResource.$resource `$resource`} service expects a response that can be deserialized as an array but receives an object, or vice versa.
 By default, all resource actions expect objects, except `query` which expects arrays.
 
 To resolve this error, make sure your `$resource` configuration matches the actual format of the data returned from the server.