Docs: deleted copy

Author: Sl1mb0

src/parallel-rustc.md

@@ -30,7 +30,6 @@ multiple queries in parallel without too much of an effort:
 - Query results are required to be immutable so they can safely be used by
   different threads concurrently.
 
-
 When a query `foo` is evaluated, the cache table for `foo` is locked.
 
 - If there already is a result, we can clone it, release the lock and
@@ -52,11 +51,6 @@ to be done.
 
 These are the basic ideas in the effort to make `rustc` parallel:
 
-- All data a query provider can access is accessed via the query context, so
-  the query context can take care of synchronizing access.
-- Query results are required to be immutable so they can safely be used by
-  different threads concurrently.
-
 - There are a lot of loops in the compiler that just iterate over all items in
   a crate. These can possibly be parallelized.
 - We can use (a custom fork of) [`rayon`] to run tasks in parallel. The custom