[mlir][vector][NFC] Clean up vector gather lowering comments

These got relocated recently.

Reviewed By: antiagainst

Differential Revision: https://reviews.llvm.org/D147257

Author: kuhar

mlir/include/mlir/Dialect/Vector/Transforms/LoweringPatterns.h

@@ -236,7 +236,7 @@ void populateVectorScanLoweringPatterns(RewritePatternSet &patterns,
 ///
 /// [FlattenGather]
 /// Flattens 2 or more dimensional `vector.gather` ops by unrolling the
-/// outermost dimension. For example:
+/// outermost dimension.
 ///
 /// [Gather1DToConditionalLoads]
 /// Turns 1-d `vector.gather` into a scalarized sequence of `vector.loads` or

mlir/lib/Dialect/Vector/Transforms/LowerVectorGather.cpp

@@ -1,4 +1,4 @@
-//===- LowerVectorScam.cpp - Lower 'vector.scan' operation ----------------===//
+//===- LowerVectorGather.cpp - Lower 'vector.gather' operation ------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
@@ -7,7 +7,7 @@
 //===----------------------------------------------------------------------===//
 //
 // This file implements target-independent rewrites and utilities to lower the
-// 'vector.scan' operation.
+// 'vector.gather' operation.
 //
 //===----------------------------------------------------------------------===//