RFR: 8332080: Update troff man page for javadoc

[Hannes Wallnöfer]

Please review a patch to update to the javadoc man page to add the `--no-fonts` option and fix a typo.

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

Commit messages:
 - JDK-8332080: Update troff man page for javadoc

Changes: https://git.openjdk.org/jdk/pull/19181/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=19181&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8332080
  Stats: 8 lines in 2 files changed: 5 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/19181.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19181/head:pull/19181

PR: https://git.openjdk.org/jdk/pull/19181