[docs] Fix a small typo on a git command in fixups.md

[jboulen]

I just replaced the typo git commit --ammend by git commit --amend

Ref: https://moodledev.io/general/development/abc/fixups

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[timhunt]

Well, change looks good to me. Thanks.

CI seems to have a problem with it. Ping me when that is fixed.

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⚡️ Lighthouse report for the deploy preview of this PR

URL	Performance	Accessibility	Best Practices	SEO	PWA	Report
/	🟠 66	🟢 95	🟢 100	🟢 90	🟢 100	Report
/docs/5.0/apis/commonfiles	🟠 50	🟢 93	🟢 100	🟢 100	🟢 100	Report
/general/development/gettingstarted	🟠 58	🟢 95	🟢 100	🟢 90	🟢 100	Report
/general/releases	🟠 58	🟢 95	🟢 100	🟢 100	🟢 100	Report

[jboulen]

@timhunt : I used git rebase --ignore-date main command and forced a new push. The CI seems to be fixed.

[timhunt]

Looks good to me. Thanks for fixing this.