8328848: Inaccuracy in the documentation of the -group option

[hns]

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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Issue

• JDK-8328848: Inaccuracy in the documentation of the -group option (Bug - P4)(⚠️ The fixVersion in this issue is [25] but the fixVersion in .jcheck/conf is 26, a new backport will be created when this pr is integrated.)

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