chore: remove repetitive words

[xinhangzhou]

Fixes #

Requirements

All new code should be covered with tests, documentation should be updated. CI should pass.

Description of the Change

Checklist

• [ ] unit-test added (if change is algorithm)
• [ ] functional test added/updated (if change is functional)
• [ ] man page updated (if applicable)
• [ ] bash completion updated (if applicable)
• [x] documentation updated
• [ ] author name in AUTHORS

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 74.78%. Comparing base (50eaf6c) to head (a2b0c58).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1255 +/- ## ======================================= Coverage 74.78% 74.78% ======================================= Files 143 143 Lines 16200 16200 ======================================= Hits 12115 12115 Misses 3148 3148 Partials 937 937 ```

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