doc: update docs for dwatermarkhelper

[USFunction]

更新dwatermarkhelper的文档,添加示例代码

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Hi @USFunction. Thanks for your PR. 😃

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[xzl01]

1.提交邮箱用公司邮箱
2.请参照其他文档格式进行提交

[USFunction]

更新dwatermarkhelper的文档,添加示例代码

[deepin-bot]

TAG Bot

New tag: 5.6.33
DISTRIBUTION: unstable
Suggest: synchronizing this PR through rebase #586

[deepin-bot]

TAG Bot

New tag: 5.6.34
DISTRIBUTION: unstable
Suggest: synchronizing this PR through rebase #598

[deepin-bot]

TAG Bot

New tag: 5.7.1
DISTRIBUTION: unstable
Suggest: synchronizing this PR through rebase #605

[deepin-bot]

TAG Bot

New tag: 5.7.2
DISTRIBUTION: unstable
Suggest: synchronizing this PR through rebase #618

[deepin-bot]

TAG Bot

New tag: 5.7.3
DISTRIBUTION: unstable
Suggest: synchronizing this PR through rebase #619

[deepin-bot]

TAG Bot

New tag: 5.7.4
DISTRIBUTION: unstable
Suggest: synchronizing this PR through rebase #623

[deepin-bot]

TAG Bot

New tag: 5.7.5
DISTRIBUTION: unstable
Suggest: synchronizing this PR through rebase #627

[deepin-bot]

TAG Bot

New tag: 5.7.6
DISTRIBUTION: unstable
Suggest: synchronizing this PR through rebase #629

[deepin-bot]

TAG Bot

New tag: 5.7.7
DISTRIBUTION: unstable
Suggest: synchronizing this PR through rebase #630

[deepin-bot]

TAG Bot

New tag: 5.7.8
DISTRIBUTION: unstable
Suggest: synchronizing this PR through rebase #633

[deepin-bot]

TAG Bot

New tag: 5.7.9
DISTRIBUTION: unstable
Suggest: synchronizing this PR through rebase #635

[deepin-bot]

TAG Bot

New tag: 5.7.10
DISTRIBUTION: unstable
Suggest: synchronizing this PR through rebase #637

[deepin-bot]

TAG Bot

New tag: 5.7.11
DISTRIBUTION: unstable
Suggest: synchronizing this PR through rebase #642

[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: justforlxz, USFunction, xzl01

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