Fix typos and grammar in CONTRIBUTING.md

[claude]

Requested by Ole Herman · Slack thread

What

Fixes four small objective errors in CONTRIBUTING.md. No behavior or guideline content changes — just readability/correctness:

• L229: "Sometimes is necessary" → "Sometimes it is necessary" (missing word).
• L948: "applied tofrom top to bottom" → "applied from top to bottom" (merged-word typo).
• L1037-1038: removed a duplicated "for your current" so the sentence reads "...the correct commit for your current branch."
• L1085: fixed an unbalanced inline-code span (a stray trailing backtick) in the git cherry-pick -x example.

How

Direct edits to the prose/markdown in CONTRIBUTING.md. No links, code, or commands were changed in substance.

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