Fix two typos in the doc

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@160762 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/LangRef.html b/docs/LangRef.html
index 04c1bf8..4d05392 100644
--- a/docs/LangRef.html
+++ b/docs/LangRef.html
@@ -2780,7 +2780,7 @@
       make it fit in <tt>TYPE</tt>.</dd>
 
   <dt><b><tt>inttoptr (CST to TYPE)</tt></b></dt>
-  <dd>Convert a integer constant to a pointer constant.  TYPE must be a pointer
+  <dd>Convert an integer constant to a pointer constant.  TYPE must be a pointer
       type.  CST must be of integer type. The CST value is zero extended,
       truncated, or unchanged to make it fit in a pointer size. This one is
       <i>really</i> dangerous!</dd>