Fix typo.

PiperOrigin-RevId: 816417379
Change-Id: I4ccfe2bf291b8c2b318ac6e2d0c2d176684e42c8

Author: Abseil Team

docs/gmock_cheat_sheet.md

@@ -130,7 +130,7 @@ TEST(BarTest, DoesThis) {
 ## Setting Default Actions {#OnCall}
 
 gMock has a **built-in default action** for any function that returns `void`,
-`bool`, a numeric value, or a pointer. In C++11, it will additionally returns
+`bool`, a numeric value, or a pointer. In C++11, it additionally returns
 the default-constructed value, if one exists for the given type.
 
 To customize the default action for functions with return type `T`, use