Clarify operation type and name requirements (graphql#441)

Author: jamesmacaulay

site/learn/Learn-Queries.md

@@ -126,8 +126,7 @@ You can see how the above query would be pretty repetitive if the fields were re
 
 ## Operation name
 
-Up until now, we have been using a shorthand syntax where we omit both the `query` keyword and the query name, but in production apps it's useful to use these to make our code less ambiguous. 
-You'll need these optional parts to a GraphQL operation if you want to execute something other than a query or pass dynamic variables.
+Up until now, we have been using a shorthand syntax where we omit both the `query` keyword and the query name, but in production apps it's useful to use these to make our code less ambiguous.
 
 Here’s an example that includes the keyword `query` as _operation type_ and `HeroNameAndFriends` as _operation name_ :
 
@@ -143,9 +142,9 @@ query HeroNameAndFriends {
 }
 ```
 
-The _operation type_ is either _query_, _mutation_, or _subscription_ and describes what type of operation you're intending to do.
+The _operation type_ is either _query_, _mutation_, or _subscription_ and describes what type of operation you're intending to do. The operation type is required unless you're using the query shorthand syntax, in which case you can't supply a name or variable definitions for your operation.
 
-The _operation name_ is a meaningful and explicit name for your operation. It can be very useful for debugging and server-side logging reasons. 
+The _operation name_ is a meaningful and explicit name for your operation. It is only required in multi-operation documents, but its use is encouraged because it is very helpful for debugging and server-side logging. 
 When something goes wrong either in your network logs or your GraphQL server, it is easier to identify a query in your codebase by name instead of trying to decipher the contents.
 Think of this just like a function name in your favorite programming language. 
 For example, in JavaScript we can easily work only with anonymous functions, but when we give a function a name, it's easier to track it down, debug our code,