Use add instead of accumulate.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@134752 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/LangRef.html b/docs/LangRef.html
index 3201731..08d84df 100644
--- a/docs/LangRef.html
+++ b/docs/LangRef.html
@@ -6591,7 +6591,7 @@
 </pre>
 
 <h5>Overview:</h5>
-<p>The '<tt>llvm.fma.*</tt>' intrinsics perform the fused multiply-accumulate
+<p>The '<tt>llvm.fma.*</tt>' intrinsics perform the fused multiply-add
    operation.</p>
 
 <h5>Arguments:</h5>