8342653: Fix minor doc issues in AnnotatedElement

[jddarcy]

Fix typo and remove redundant @since tags.

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Issue

• JDK-8342653: Fix minor doc issues in AnnotatedElement (Bug - P4)

Reviewers

• Jaikiran Pai (@jaikiran - Reviewer)
• Iris Clark (@irisclark - Reviewer)

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8342653: Fix minor doc issues in AnnotatedElement

Reviewed-by: jpai, iris

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[mlbridge]

Webrevs

• 00: Full (d154293f)

[jaikiran]

This looks OK to me. The class itself is commented with @since 1.5, so removing it from methods which were introduced in the same release looks correct.