[mlir] Fix/Clarify parts of MLIR toy tutorial chapter 6+7

Summary:
* add missing comma.
* remove "having to register them here" phrasing, since register it
  is what we're doing, which made the comment a bit confusing.
* remove duplicate code.
* clarify link to chapter 3, since "folder" doesn't appear in that
  chapter.

Differential Revision: https://reviews.llvm.org/D75263

diff --git a/mlir/docs/Tutorials/Toy/Ch-6.md b/mlir/docs/Tutorials/Toy/Ch-6.md
index bfca5c9..0444d2a 100644 (file)
--- a/mlir/docs/Tutorials/Toy/Ch-6.md
+++ b/mlir/docs/Tutorials/Toy/Ch-6.md
@@ -94,7 +94,7 @@ by relying on [transitive lowering](../../../getting_started/Glossary.md#transit
   mlir::populateLoopToStdConversionPatterns(patterns, &getContext());
   mlir::populateStdToLLVMConversionPatterns(typeConverter, patterns);
 
-  // The only remaining operation to lower from the `toy` dialect, is the
+  // The only remaining operation, to lower from the `toy` dialect, is the
   // PrintOp.
   patterns.insert<PrintOpLowering>(&getContext());
 ```

diff --git a/mlir/docs/Tutorials/Toy/Ch-7.md b/mlir/docs/Tutorials/Toy/Ch-7.md
index 64febd4..75ef4cc 100644 (file)
--- a/mlir/docs/Tutorials/Toy/Ch-7.md
+++ b/mlir/docs/Tutorials/Toy/Ch-7.md
@@ -74,7 +74,7 @@ DEFINE_SYM_KIND_RANGE(LINALG) // Linear Algebra Dialect
 DEFINE_SYM_KIND_RANGE(TOY)    // Toy language (tutorial) Dialect
 
 // The following ranges are reserved for experimenting with MLIR dialects in a
-// private context without having to register them here.
+// private context.
 DEFINE_SYM_KIND_RANGE(PRIVATE_EXPERIMENTAL_0)
 ```
 
@@ -401,9 +401,7 @@ that contains a set of constant values for each of the `struct` elements.
 This new operation materializes the Nth element of a `struct` value.
 
 ```mlir
-  %0 = toy.struct_constant [
-    dense<[[1.0, 2.0, 3.0], [4.0, 5.0, 6.0]]> : tensor<2x3xf64>
-  ] : !toy.struct<tensor<*xf64>>
+  // Using %0 from above
   %1 = toy.struct_access %0[0] : !toy.struct<tensor<*xf64>> -> tensor<*xf64>
 ```
 
@@ -481,9 +479,10 @@ module {
 ```
 
 We have several `toy.struct_access` operations that access into a
-`toy.struct_constant`. As detailed in [chapter 3](Ch-3.md), we can add folders
-for these `toy` operations by setting the `hasFolder` bit on the operation
-definition and providing a definition of the `*Op::fold` method.
+`toy.struct_constant`. As detailed in [chapter 3](Ch-3.md) (FoldConstantReshape),
+we can add folders for these `toy` operations by setting the `hasFolder` bit
+on the operation definition and providing a definition of the `*Op::fold`
+method.
 
 ```c++
 /// Fold constants.