RFR: 8298457 Instructions in a11y manual tests need to be updated

[Artem Semenov]

Test instructions:
- Accessible Actions Test;
- AccessibleJTabbedPaneTest;
- Accessible Text Test.
contain inaccurate indications of actions in different screen readers.

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Commit messages:
 - 8298457 Instructions in a11y manual tests need to be updated

Changes: https://git.openjdk.org/jdk/pull/11607/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11607&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8298457
  Stats: 5 lines in 3 files changed: 0 ins; 0 del; 5 mod
  Patch: https://git.openjdk.org/jdk/pull/11607.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11607/head:pull/11607

PR: https://git.openjdk.org/jdk/pull/11607