RFR: Fixed links and a few other minor changes

[Jesper Wilhelmsson]

Changed openjdk.java.net to openjdk.org.

-------------

Commit messages:
 - Oops
 - Fix all links to openjdk.org
 - Updated Author description
 - Merge remote-tracking branch 'origin/master' into stuff
 - Updated todo list
 - Minor fixes

Changes: https://git.openjdk.org/guide/pull/89/files
 Webrev: https://webrevs.openjdk.org/?repo=guide&pr=89&range=00
  Stats: 130 lines in 17 files changed: 4 ins; 4 del; 122 mod
  Patch: https://git.openjdk.org/guide/pull/89.diff
  Fetch: git fetch https://git.openjdk.org/guide pull/89/head:pull/89

PR: https://git.openjdk.org/guide/pull/89