[mlir][NFC] Fix format of comments for foldHook (#118453)

Author: CoTinker

mlir/include/mlir/IR/OperationSupport.h

@@ -249,12 +249,10 @@ class OperationName {
   ///  1. They can leave the operation alone and without changing the IR, and
   ///     return failure.
   ///  2. They can mutate the operation in place, without changing anything
-  ///  else
-  ///     in the IR.  In this case, return success.
+  ///     else in the IR. In this case, return success.
   ///  3. They can return a list of existing values that can be used instead
-  ///  of
-  ///     the operation.  In this case, fill in the results list and return
-  ///     success.  The caller will remove the operation and use those results
+  ///     of the operation. In this case, fill in the results list and return
+  ///     success. The caller will remove the operation and use those results
   ///     instead.
   ///
   /// This allows expression of some simple in-place canonicalizations (e.g.