[MLIR][Linalg] fix linalg.pack description

Fix formula describing the mapping from inner_tiles to result shape.
When the comment says "tiles are added to the end of the result tensor"
it is meant to say tile dimensions are after the dimension that have
been tiled.

Author: RoboTux

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

@@ -108,7 +108,7 @@ def Linalg_PackOp : Linalg_RelayoutOp<"pack", [
     within [0, n).
      - The tiled dimensions (of size `inner_tiles`) are added to the end of the
      result tensor in the order in which they appear, i.e.
-     `shape(result)[rank(result) + i] = inner_tiles[i]` for `0 <= i < k`.
+     `shape(result)[rank(source) + i] = inner_tiles[i]` for `0 <= i < k`.
      - The following relationship for the tiled dimensions holds:
      `shape(result)[inner_dims_pos[i]] = shape(source)[inner_dims_pos[i]] / inner_tiles[i]`,
      where (⌈/⌉ indicates CeilDiv).