Fix format/typos in table "Cryptography Standards"

In chapter "40. Hypervisor Selection" of the security-guide, the table
under the heading "Cryptography Standards" had some formatting issues:
missing or extra spaces, extra line breaks, and inconsistent wording
for key lengths.

In addition, key lengths for serpent and twofish were incorrectly given
as 196 bits where they should be 192 bits.

Capitalization may need work, too, but I'm not sure I'd get it all
right.

Change-Id: Ibf7013b1aaff424a56190e8116e1fcba01c3b252
Merge "Fix format/typos in table "Cryptography Standards""