Remove duplicated words in Javadoc comments

[veryyet]

Remove duplicated words in Javadoc comments.

Testing done

Tested by the javadoc compiler. No other testing

Proposed changelog entries

N/A

Proposed upgrade guidelines

N/A

Submitter checklist

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1. The Jira issue, if it exists, is well-described.

   The Jira issue, if it exists, is well-described.
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2. The changelog entries and upgrade guidelines are appropriate for the audience affected by the change (users or developers, depending on the change) and are in the imperative mood (see [examples](https://github.com/jenkins-infra/jenkins.io/blob/master/content/_data/changelogs/weekly.yml)). Fill in the **Proposed upgrade guidelines** section only if there are breaking changes or changes that may require extra steps from users during upgrade.

   The changelog entries and upgrade guidelines are appropriate for the audience affected by the change (users or developers, depending on the change) and are in the imperative mood (see examples). Fill in the Proposed upgrade guidelines section only if there are breaking changes or changes that may require extra steps from users during upgrade.
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3. There is automated testing or an explanation as to why this change has no tests.

   There is automated testing or an explanation as to why this change has no tests.
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4. New public classes, fields, and methods are annotated with `@Restricted` or have `@since TODO` Javadocs, as appropriate.

   New public classes, fields, and methods are annotated with @Restricted or have @since TODO Javadocs, as appropriate.
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5. New deprecations are annotated with `@Deprecated(since = "TODO")` or `@Deprecated(forRemoval = true, since = "TODO")`, if applicable.

   New deprecations are annotated with @Deprecated(since = "TODO") or @Deprecated(forRemoval = true, since = "TODO"), if applicable.
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6. New or substantially changed JavaScript is not defined inline and does not call `eval` to ease future introduction of Content Security Policy (CSP) directives (see [documentation](https://www.jenkins.io/doc/developer/security/csp/)).

   New or substantially changed JavaScript is not defined inline and does not call eval to ease future introduction of Content Security Policy (CSP) directives (see documentation).
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7. For dependency updates, there are links to external changelogs and, if possible, full differentials.

   For dependency updates, there are links to external changelogs and, if possible, full differentials.
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8. For new APIs and extension points, there is a link to at least one consumer.

   For new APIs and extension points, there is a link to at least one consumer.
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Maintainer checklist

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1. There are at least two (2) approvals for the pull request and no outstanding requests for change.

   There are at least two (2) approvals for the pull request and no outstanding requests for change.
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2. Conversations in the pull request are over, or it is explicit that a reviewer is not blocking the change.

   Conversations in the pull request are over, or it is explicit that a reviewer is not blocking the change.
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3. Changelog entries in the pull request title and/or **Proposed changelog entries** are accurate, human-readable, and in the imperative mood.

   Changelog entries in the pull request title and/or Proposed changelog entries are accurate, human-readable, and in the imperative mood.
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4. Proper changelog labels are set so that the changelog can be generated automatically.

   Proper changelog labels are set so that the changelog can be generated automatically.
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5. If the change needs additional upgrade steps from users, the `upgrade-guide-needed` label is set and there is a **Proposed upgrade guidelines** section in the pull request title (see [example](https://github.com/jenkinsci/jenkins/pull/4387)).

   If the change needs additional upgrade steps from users, the upgrade-guide-needed label is set and there is a Proposed upgrade guidelines section in the pull request title (see example).
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6. If it would make sense to backport the change to LTS, a Jira issue must exist, be a _Bug_ or _Improvement_, and be labeled as `lts-candidate` to be considered (see [query](https://issues.jenkins.io/issues/?filter=12146)).

   If it would make sense to backport the change to LTS, a Jira issue must exist, be a Bug or Improvement, and be labeled as lts-candidate to be considered (see query).
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Add item to Maintainer checklist

[welcome]

Yay, your first pull request towards Jenkins core was created successfully! Thank you so much!

A contributor will provide feedback soon. Meanwhile, you can join the chats and community forums to connect with other Jenkins users, developers, and maintainers.

[MarkEWaite]

@veryyet thanks for the pull request. In future pull requests, please complete the pull request template rather than leaving it unmodified. Reviewers depend on the pull request template being completed.

[veryyet]

@veryyet thanks for the pull request. In future pull requests, please complete the pull request template rather than leaving it unmodified. Reviewers depend on the pull request template being completed.

Thanks!

[welcome]

Congratulations on getting your very first Jenkins core pull request merged 🎉🥳

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