[NFC] Fix minor typos in comments and reuse concreteOp.

[jurahul]

Summary

As above.

[mehdi_amini]

I'm perfectly fine if you push such trivial fixes without code review FYI

mlir/include/mlir/Dialect/Linalg/IR/LinalgStructuredOps.td

 
 include "mlir/Dialect/Affine/IR/AffineOpsBase.td"
 include "mlir/Dialect/Linalg/IR/LinalgBase.td"
 include "mlir/Dialect/Linalg/IR/LinalgStructuredOpsInterface.td"
 include "mlir/Interfaces/CopyOpInterface.td"
 
 // The Linalg `NInputs` trait provides the API for ops that are known
 // to have a specified number of inputs, all passed as operands.
-// See Linalg/LinalgTraits.h for implementation details an usage.
+// See Linalg/LinalgTraits.h for implementation details and usage.
 class NInputs<int args_in> :
   NativeOpTrait<"linalg::NInputs<" # !cast<string>(args_in) # ">::Impl"> {}
 
 // The Linalg `NOutputs` trait provides the API for ops that are known
 // to have a specified number of outputs, all passed as operands.
-// See Linalg/LinalgTraits.h for implementation details an usage.
+// See Linalg/LinalgTraits.h for implementation details and usage.
 class NOutputs<int args_out> :
   NativeOpTrait<"linalg::NOutputs<" # !cast<string>(args_out) # ">::Impl"> {}
 
 def StructuredOpTraits : NativeOpTrait<"linalg::StructuredOpTraits">;
 def NamedStructuredOpTrait : NativeOpTrait<"linalg::NamedStructuredOpTrait">;
 
 // Base Tablegen class for Linalg ops.
 // Linalg ops that correspond to library calls operate on linalg::View as their

mlir/include/mlir/Dialect/Linalg/IR/LinalgTraits.h

 ///   class DotOp : public Op<DotOp, OpTrait::StructuredOpTraits> {
 ///
 template <typename ConcreteType>
 class StructuredOpTraits
     : public OpTrait::TraitBase<ConcreteType, StructuredOpTraits> {
 public:
   static LogicalResult verifyTrait(Operation *op) {
     ConcreteType concreteOp = cast<ConcreteType>(op);
-    auto nOperands = cast<ConcreteType>(op).getNumInputsAndOutputBuffers();
+    auto nOperands = concreteOp.getNumInputsAndOutputBuffers();
     if (failed(OpTrait::impl::verifyAtLeastNOperands(op, nOperands)))
       return failure();
     if (op->getNumResults() > concreteOp.getNumOutputs())
       return op->emitError("unexpected #results > #outputs");
     return success();
   }
 };