docs: correct the spelling error

[iutx]

Fixes # No relevant issues.

RELEASE NOTES: NONE

[github-actions[bot]]

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[iutx]

I have read the CLA Document and I hereby sign the CLA

[codecov[bot]]

Codecov Report

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

Comparison is base (5dad29f) 86.02078% compared to head (c971eac) 86.00856%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #163 +/- ## =================================================== - Coverage 86.02078% 86.00856% -0.01222% =================================================== Files 190 190 Lines 16360 16360 =================================================== - Hits 14073 14071 -2 - Misses 1725 1728 +3 + Partials 562 561 -1 ``` | [Flag](https://app.codecov.io/gh/trpc-group/trpc-go/pull/163/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=trpc-group) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/trpc-group/trpc-go/pull/163/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=trpc-group) | `86.00856% <ø> (-0.01222%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=trpc-group#carryforward-flags-in-the-pull-request-comment) to find out more.

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[iutx]

Similar fixes:

• trpc-cpp fix
• trp fix