Switch a comment in Rewrite from 'instantiation' to 'expansion'.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@135226 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Rewrite/HTMLRewrite.cpp b/lib/Rewrite/HTMLRewrite.cpp
index df08cd7..0b54755 100644
--- a/lib/Rewrite/HTMLRewrite.cpp
+++ b/lib/Rewrite/HTMLRewrite.cpp
@@ -516,7 +516,7 @@
     }
 
     // Okay, we have the first token of a macro expansion: highlight the
-    // instantiation by inserting a start tag before the macro instantiation and
+    // expansion by inserting a start tag before the macro expansion and
     // end tag after it.
     std::pair<SourceLocation, SourceLocation> LLoc =
       SM.getInstantiationRange(Tok.getLocation());