[Jah-yee]

What does this PR do?

Fixes three spelling mistakes in the git-sync repository:

1. README.md (line 297) and main.go (line 2679) — the --exechook-timeout flag description reads "If the timeout for the --exechook-command is not specifid"; changed specifid to specified.
2. main.go (line 1531) — the comment above the worktree HEAD check reads "Make sure it is synced to the right commmit."; changed commmit to commit.
3. pkg/hook/hook.go (line 161) — the doc comment for sendOneTimeResultAndTerminate reads "closes said chanel"; changed chanel to channel.

Why

These are user-facing: the --exechook-timeout wording appears in git-sync --help output via the main.go usage text, so specifid is visible to anyone reading the flag documentation.

Testing

Documentation/comment-only change — no behavior is altered. go build ./... and go vet ./... pass locally on the branch.

Notes for reviewers

The README.md flag table and the main.go usage string are kept in sync, so both were corrected together. Happy to split the commit or drop any part if you prefer a narrower change.

[kubernetes-prow]

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[sdowell]

/lgtm
/approve

[kubernetes-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Jah-yee, sdowell

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