Fix comments

Author: sinkuu

src/librustc_mir/borrow_check.rs

@@ -1169,8 +1169,10 @@ impl<'c, 'b, 'a: 'b+'c, 'gcx, 'tcx: 'a> MirBorrowckCtxt<'c, 'b, 'a, 'gcx, 'tcx>
         err.emit();
     }
 
-    /// Finds the span of arguments of aclosure (within `maybe_closure_span`) and its usage of
+    /// Finds the span of arguments of a closure (within `maybe_closure_span`) and its usage of
     /// the local assigned at `location`.
+    /// This is done by searching in statements succeeding `location`
+    /// and originating from `maybe_closure_span`.
     fn find_closure_span(
         &self,
         maybe_closure_span: Span,

src/test/ui/borrowck/borrowck-closures-two-mut.rs

@@ -1,4 +1,4 @@
-// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
+// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
 // file at the top-level directory of this distribution and at
 // http://rust-lang.org/COPYRIGHT.
 //