Change "be returning" to "return"

Author: kraai

src/librustc_mir/borrow_check/universal_regions.rs

@@ -5,7 +5,7 @@
 //! fn foo<'a, 'b, 'c: 'b>() { }
 //! ```
 //!
-//! here we would be returning a map assigning each of `{'a, 'b, 'c}`
+//! here we would return a map assigning each of `{'a, 'b, 'c}`
 //! to an index, as well as the `FreeRegionMap` which can compute
 //! relationships between them.
 //!

src/libstd/env.rs

@@ -6,7 +6,7 @@
 //!
 //! There are several functions and structs in this module that have a
 //! counterpart ending in `os`. Those ending in `os` will return an [`OsString`]
-//! and those without will be returning a [`String`].
+//! and those without will return a [`String`].
 //!
 //! [`OsString`]: ../../std/ffi/struct.OsString.html
 //! [`String`]: ../string/struct.String.html