fix some typos in the doc

llvm-svn: 292014
diff --git a/llvm/docs/TestingGuide.rst b/llvm/docs/TestingGuide.rst
index 5dac583..26143fe 100644
--- a/llvm/docs/TestingGuide.rst
+++ b/llvm/docs/TestingGuide.rst
@@ -313,7 +313,7 @@
       ret i32 0
   }
 
-``ModuleID`` can unexpetedly match against ``CHECK`` lines.  For example:
+``ModuleID`` can unexpectedly match against ``CHECK`` lines.  For example:
 
 .. code-block:: llvm