Javadoc: "value" should not only be suggested at constants

### Description

When using code completing after typing `{@` in Javadoc, "value" is not in the list.

### Are you willing to submit a pull request?

No

Reproduce the issue in the NetBeans Java editor by typing {@ in Javadoc completion, then trace the completion handling for Javadoc tags and the special treatment of constants. Done means "value" appears in the appropriate completion list after {@, not only when editing a constant.

Written by the indexing model from the issue text.