Fix Query type docs

`give` no longer exists, `compute` is used to generate query results
now.

src/librustc_interface/queries.rs

@@ -22,7 +22,7 @@ use std::mem;
 use syntax::{self, ast};
 
 /// Represent the result of a query.
-/// This result can be stolen with the `take` method and returned with the `give` method.
+/// This result can be stolen with the `take` method and generated with the `compute` method.
 pub struct Query<T> {
     result: RefCell<Option<Result<T>>>,
 }
@@ -37,7 +37,7 @@ impl<T> Query<T> {
     }
 
     /// Takes ownership of the query result. Further attempts to take or peek the query
-    /// result will panic unless it is returned by calling the `give` method.
+    /// result will panic unless it is generated by calling the `compute` method.
     pub fn take(&self) -> T {
         self.result
             .borrow_mut()