fixup: correct typos

Author: abulavin

mlir/lib/IR/AttributeDetail.h

@@ -395,8 +395,8 @@ class DistinctAttributeUniquer {
 };
 
 /// An allocator for distinct attribute storage instances. Uses a synchronized
-/// BumpPtrAllocator to ensure allocated storage is deleted when the
-/// DistinctAttributeAllocator is destroyed
+/// BumpPtrAllocator to ensure thread-safety. The allocated storage is deleted
+/// when the DistinctAttributeAllocator is destroyed.
 class DistinctAttributeAllocator final {
 public:
   DistinctAttributeAllocator() = default;
@@ -412,11 +412,11 @@ class DistinctAttributeAllocator final {
   };
 
 private:
-  /// Used to allocate Distict Attribute storage. When this allocator destroyed
-  /// in till also dealllocate any storage instances
+  /// Used to allocate Distict Attribute storages. The managed memory is freed
+  /// automatically when the allocator instance is destroyed.
   llvm::BumpPtrAllocator allocator;
 
-  /// Used to lock access to the allocator
+  /// Used to lock access to the allocator.
   std::mutex allocatorMutex;
 };
 } // namespace detail

mlir/unittests/IR/DistinctAttributeAllocatorTest.cpp

@@ -1,11 +1,10 @@
-//===- DistinctAttributeAllocatorTest.cpp - DistinctAttr storage alloc test
-//-===//
+//=== DistinctAttributeAllocatorTest.cpp - DistinctAttr storage alloc test ===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
-//===-----------------------------------------------------------------------===//
+//===----------------------------------------------------------------------===//
 
 #include "gtest/gtest.h"
 
@@ -19,7 +18,7 @@ using namespace mlir;
 
 //
 // Test that a DistinctAttr that is created on a separate thread does
-// not have its storage deleted when the thread joins
+// not have its storage deleted when the thread joins.
 //
 TEST(DistinctAttributeAllocatorTest, TestAttributeWellFormedAfterThreadJoin) {
   MLIRContext ctx;