[valhalla-docs] RFR: SoV part 2: Typos & typography

[Mark Reinhold]

Various fixes to correct typos and typography.

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Commit messages:
 - SoV part 2: Typos & typography

Changes: https://git.openjdk.java.net/valhalla-docs/pull/9/files
 Webrev: https://webrevs.openjdk.java.net/?repo=valhalla-docs&pr=9&range=00
  Stats: 23 lines in 1 file changed: 3 ins; 0 del; 20 mod
  Patch: https://git.openjdk.java.net/valhalla-docs/pull/9.diff
  Fetch: git fetch https://git.openjdk.java.net/valhalla-docs pull/9/head:pull/9

PR: https://git.openjdk.java.net/valhalla-docs/pull/9