[VectorOps] Update vector transfer read op comments.

[andydavis1]

Summary

Update vector transfer read op comments.

[merge_guards_bot]

Unit tests: pass. 61804 tests passed, 0 failed and 781 were skipped.

clang-tidy: unknown.

clang-format: pass.

Build artifacts: diff.json, clang-format.patch, CMakeCache.txt, console-log.txt, test-results.xml

[andydavis1]

Submitting change.

[andydavis1]

Address comments

[merge_guards_bot]

Unit tests: pass. 61804 tests passed, 0 failed and 781 were skipped.

clang-tidy: unknown.

clang-format: pass.

Build artifacts: diff.json, clang-format.patch, CMakeCache.txt, console-log.txt, test-results.xml

mlir/include/mlir/Dialect/VectorOps/VectorOps.td

def Vector_TransferReadOp :
 
   let summary = "Reads a supervector from memory into an SSA vector value.";
 
   let description = [{
     The `vector.transfer_read` op performs a blocking read from a slice within
     a [MemRef](../LangRef.md#memref-type) supplied as its first operand
     into a [vector](../LangRef.md#vector-type) of the same base elemental type.
 
-    A vector memref operand must have its vector element type match a suffix
-    (shape and element type) of the vector (e.g. memref<3x2x6x4x3xf32>,
-    vector<1x1x4x3xf32>).
+    A memref operand with vector element type, must have its vector element
+    type match a suffix (shape and element type) of the vector (e.g.
+    memref<3x2x6x4x3xf32>, vector<1x1x4x3xf32>).
 
     The slice is further defined by a full-rank index within the MemRef,
     supplied as the operands `2 .. 1 + rank(memref)`. The permutation_map
     [attribute](../LangRef.md#attributes) is an
     [affine-map](Affine.md#affine-maps) which specifies the transposition on the
     slice to match the vector shape. The size of the slice is specified by the
     size of the vector, given as the return type. An `ssa-value` of the same
     elemental type as the MemRef is provided as the last operand to specify