RFR: 8328848: Inaccuracy in the documentation of the -group option

Tue May 13 13:21:05 UTC 2025

Please review a documentation fix in the `javadoc` man page to document that the `-group` option can be used with packages or modules depending on documented code. 

Although the help output of the `javadoc` tool already included this fact I replaced the abstract term "elements" with "packages or modules" to make it a bit more concrete.

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Commit messages:
 - JDK-8328848: Inaccuracy in the documentation of the -group option

Changes: https://git.openjdk.org/jdk/pull/25212/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25212&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8328848
  Stats: 4 lines in 2 files changed: 1 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/25212.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25212/head:pull/25212

PR: https://git.openjdk.org/jdk/pull/25212