Fix documentation typo from r292558.

zygoloid · zygoloid · commit 425765b62654 · 2017-01-23T18:17:46.000Z
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@292811 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/LanguageExtensions.rst b/docs/LanguageExtensions.rst
@@ -1780,7 +1780,7 @@ String builtins
 ---------------
 
 Clang provides constant expression evaluation support for builtins forms of
-the following functions from the C standard library ``<strings.h>`` header:
+the following functions from the C standard library ``<string.h>`` header:
 
 * ``memchr``
 * ``memcmp``
