[mlir][arith][NFC] Minor Revisions to Comments (#158757)

This is a minor nitpick PR to fix a few comments.

GitOrigin-RevId: f854009307d3f3750d3358510ef632571683acb5
diff --git a/lib/Dialect/Arith/IR/ArithCanonicalization.td b/lib/Dialect/Arith/IR/ArithCanonicalization.td
index 4558d82..de3efc9 100644
--- a/lib/Dialect/Arith/IR/ArithCanonicalization.td
+++ b/lib/Dialect/Arith/IR/ArithCanonicalization.td
@@ -394,7 +394,7 @@
         [(TruncationMatchesShiftAmount $x, $tr, $c0)]>;
 
 //===----------------------------------------------------------------------===//
-// TruncIOp
+// TruncFOp
 //===----------------------------------------------------------------------===//
 
 // truncf(sitofp(x)) -> sitofp(x) if default rounding mode.
diff --git a/lib/Dialect/Arith/IR/ArithOps.cpp b/lib/Dialect/Arith/IR/ArithOps.cpp
index 7d4d818..1fbb7a4 100644
--- a/lib/Dialect/Arith/IR/ArithOps.cpp
+++ b/lib/Dialect/Arith/IR/ArithOps.cpp
@@ -2723,7 +2723,7 @@
   return nullptr;
 }
 
-/// Return the identity numeric value associated to the give op.
+/// Returns the identity numeric value of the given op.
 std::optional<TypedAttr> mlir::arith::getNeutralElement(Operation *op) {
   std::optional<AtomicRMWKind> maybeKind =
       llvm::TypeSwitch<Operation *, std::optional<AtomicRMWKind>>(op)