fix the wording in versionadded directives
minor #3834 fix the wording in versionadded directives (for the master branch) (xabbuh)

This PR was merged into the master branch.

Discussion
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fix the wording in versionadded directives (for the master branch)

| Q             | A
| ------------- | ---
| Doc fix?      | yes
| New docs?     | no
| Applies to    | 2.5+
| Fixed tickets |

Commits
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36f68b6 fix the wording in versionadded directives