[valhalla-docs] RFR: Fix minor details

[Aggelos Biboudis]

Minor details

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Commit messages:
 - Fix minor details

Changes: https://git.openjdk.java.net/valhalla-docs/pull/3/files
 Webrev: https://webrevs.openjdk.java.net/?repo=valhalla-docs&pr=3&range=00
  Stats: 7 lines in 2 files changed: 0 ins; 0 del; 7 mod
  Patch: https://git.openjdk.java.net/valhalla-docs/pull/3.diff
  Fetch: git fetch https://git.openjdk.java.net/valhalla-docs pull/3/head:pull/3

PR: https://git.openjdk.java.net/valhalla-docs/pull/3