RFR: JDK-8273860: Javadoc Deprecated API list should not use italic font for description column

[Hannes Wallnöfer]

Please review a trivial change to use plain font for deprecation comments in the Deprecated API page. Italic font is used to make deprecation comments stand out against other parts of the documentation, but here the content consists exclusively of deprecation comments so the same so the font style should be the same as in other API summary pages.

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Commit messages:
 - JDK-8273860: Javadoc Deprecated API list should not use italic font for description column

Changes: https://git.openjdk.org/jdk/pull/9375/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=9375&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8273860
  Stats: 23 lines in 5 files changed: 0 ins; 0 del; 23 mod
  Patch: https://git.openjdk.org/jdk/pull/9375.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9375/head:pull/9375

PR: https://git.openjdk.org/jdk/pull/9375