Minor improvements in comment for

compiler/rustc_infer/src/infer/freshen.rs

@@ -5,7 +5,7 @@
 //! Freshening is used primarily to get a good type for inserting into a cache. The result
 //! summarizes what the type inferencer knows "so far". The primary place it is used right now is
 //! in the trait matching algorithm, which needs to be able to cache whether an `impl` self type
-//! matches some other type X -- *without* affecting `X`. That means if that if the type `X` is in
+//! matches some other type X -- *without* affecting `X`. That means that if the type `X` is in
 //! fact an unbound type variable, we want the match to be regarded as ambiguous, because depending
 //! on what type that type variable is ultimately assigned, the match may or may not succeed.
 //!
@@ -21,7 +21,7 @@
 //! Because of the manipulation required to handle closures, doing arbitrary operations on
 //! freshened types is not recommended. However, in addition to doing equality/hash
 //! comparisons (for caching), it is possible to do a `ty::_match` operation between
-//! 2 freshened types - this works even with the closure encoding.
+//! two freshened types - this works even with the closure encoding.
 //!
 //! __An important detail concerning regions.__ The freshener also replaces *all* free regions with
 //! 'erased. The reason behind this is that, in general, we do not take region relationships into