docs: fix wrong doc on FundingTransactionFailed

[codecov-commenter]

Codecov Report

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

Project coverage is 46.48%. Comparing base (feefe59) to head (94c7033).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #322 +/- ## ======================================= Coverage 46.47% 46.48% ======================================= Files 45 45 Lines 28511 28511 ======================================= + Hits 13251 13252 +1 + Misses 15260 15259 -1 ``` | [Flag](https://app.codecov.io/gh/nervosnetwork/fiber/pull/322/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nervosnetwork) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/nervosnetwork/fiber/pull/322/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nervosnetwork) | `46.48% <ø> (+<0.01%)` | :arrow_up: | 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=nervosnetwork#carryforward-flags-in-the-pull-request-comment) to find out more.

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