Use rank() instead of dimensions() in pseudocode

rank() is consistent with the rest of the specification.
Also add a bit of whitespace in the pseudocode for easier
reading.
Fix one typo.

Change-Id: Ifa794b2c332cb70cd52a141d9af219e26bd3dca0
Signed-off-by: Eric Kunze <eric.kunze@arm.com>