Bump required cmake version on CMake.html.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120162 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/CMake.html b/docs/CMake.html
index e2dac2e..c5c5538 100644
--- a/docs/CMake.html
+++ b/docs/CMake.html
@@ -68,7 +68,7 @@
 <ol>
 
   <li><p><a href="http://www.cmake.org/cmake/resources/software.html">Download</a>
-      and install CMake. Version 2.6.2 is the minimum required.</p>
+      and install CMake. Version 2.8 is the minimum required.</p>
 
   <li><p>Open a shell. Your development tools must be reachable from this
       shell through the PATH environment variable.</p>