Correct typo

Author: est31

src/test/ui/moves/move-guard-same-consts.rs

@@ -2,7 +2,7 @@
 // arms whose patterns were composed solely of constants to not have
 // them linked in the cfg.
 //
-// THis was broken for various reasons. In particular, that hack was
+// This was broken for various reasons. In particular, that hack was
 // originally authored under the assunption that other checks
 // elsewhere would ensure that the two patterns did not overlap.  But
 // that assumption did not hold, at least not in the long run (namely,