RFR: 8282149: Add missing XLint keys to man page

[Ethan McCue]

Adds all the XLint options that were noted as missing in the man page by the issue.

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Commit messages:
 - Punctuation fix
 - Add missing XLint keys to man page

Changes: https://git.openjdk.java.net/jdk/pull/7971/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7971&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8282149
  Stats: 10 lines in 1 file changed: 10 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7971.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7971/head:pull/7971

PR: https://git.openjdk.java.net/jdk/pull/7971