typo: fix `timedout` typo

[HuSharp]

What problem does this PR solve?

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[codecov-commenter]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (48b5119) 53.38% compared to head (5f5bb91) 53.37%.

:exclamation: Current head 5f5bb91 differs from pull request most recent head eb87a40. Consider uploading reports for the commit eb87a40 to get more accurate results

Files	Patch %	Lines
pkg/cluster/executor/ssh.go	0.00%	2 Missing :warning:
pkg/exec/run.go	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #2345 +/- ## ========================================== - Coverage 53.38% 53.37% -0.01% ========================================== Files 328 328 Lines 34828 34828 ========================================== - Hits 18591 18587 -4 - Misses 13978 13981 +3 - Partials 2259 2260 +1 ``` | [Flag](https://app.codecov.io/gh/pingcap/tiup/pull/2345/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap) | Coverage Δ | | |---|---|---| | [tiup](https://app.codecov.io/gh/pingcap/tiup/pull/2345/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap) | `33.56% <0.00%> (-0.05%)` | :arrow_down: | | [unittest](https://app.codecov.io/gh/pingcap/tiup/pull/2345/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap) | `22.35% <0.00%> (ø)` | | 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=pingcap#carryforward-flags-in-the-pull-request-comment) to find out more.

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[breezewish]

Timedout is typo of timed out instead of timeout:

• Timeout: n. Example: The timeout of an operation is 10 minutes.
• Timed out: v. (past) Example: Timed out waiting for the operation to finish.

[HuSharp]

Timedout is typo of timed out instead of timeout:

• Timeout: n. Example: The timeout of an operation is 10 minutes.
• Timed out: v. (past) Example: Timed out waiting for the operation to finish.

get it