spelling: that

Signed-off-by: Josh Soref <[email protected]>

Author: jsoref

lib/IDE/Refactoring.cpp

@@ -5239,7 +5239,7 @@ struct ClassifiedBlocks {
   ClassifiedBlock ErrorBlock;
 };
 
-/// Classifier of callback closure statements that that have either multiple
+/// Classifier of callback closure statements that have either multiple
 /// non-Result parameters or a single Result parameter and return Void.
 ///
 /// It performs a (possibly incorrect) best effort and may give up in certain