RFR: Minor bugfixes

[Jesper Wilhelmsson]

Fixes and a clarification.

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Commit messages:
 - RN-MultipleLinks
 - Bug in code owners link
 - Missing top-link
 - Clarifications and bugfixes

Changes: https://git.openjdk.org/guide/pull/117/files
 Webrev: https://webrevs.openjdk.org/?repo=guide&pr=117&range=00
  Stats: 18 lines in 6 files changed: 9 ins; 3 del; 6 mod
  Patch: https://git.openjdk.org/guide/pull/117.diff
  Fetch: git fetch https://git.openjdk.org/guide.git pull/117/head:pull/117

PR: https://git.openjdk.org/guide/pull/117