This change fixes most broken links.

Commit #1 and #2
Fixes several broken links.

Commit #3
Remove note linking to document that no longer exists in reponse to Tracy's
comment.

Commit #4
Do the above for good.

Commit #5 and #6
Fixes many of the remaining broken links, based on the w3c and xenu link
checkers.

Before this change, with Xenu we have:
25 broken link(s) reported
3 bad local link(s) reported

After this change, we have:
4 broken link(s) reported
0 bad local link(s) reported

Commit #7
Fixes Tracy's comments on latest commit.

[ci-skip]

Change-Id: I57d942c19f0904548fc6298408c459940c5d33a8
Signed-off-by: Arnaud J Le Hors <lehors@us.ibm.com>