"In the create bar section, click on the Create Materials bar and from the pop-up menu select Create Textures"
this may refer to the "create" menu, which you'll find on the menubar of the "hypershade" window.
But it is indeed a mystake form the book as there is no "create material/create texture" menu.
The "grid" is situated on the "create 2D textures" submenu ...
"tutorial in an official Maya book" ? Maybe they didn't had maya open in front of them when they wrote it ...
Guy.