Fix documentation typo, from nobled.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@121768 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/UsersManual.html b/docs/UsersManual.html
index f4e414a..51b33bd 100644
--- a/docs/UsersManual.html
+++ b/docs/UsersManual.html
@@ -924,7 +924,7 @@
 certain constructs (including __declspec and Microsoft-style asm statements).
 </p>
 
-<li>clang allows setting _MCS_VER with -fmsc-version=. It defaults to 1300 which
+<li>clang allows setting _MSC_VER with -fmsc-version=. It defaults to 1300 which
 is the same as Visual C/C++ 2003. Any number is supported and can greatly affect
 what Windows SDK and c++stdlib headers clang can compile. This option will be
 removed when clang supports the full set of MS extensions required for these