docs: correct minor typos in docs and test descriptions

[FrankFMY]

• Add missing period after "e.g" in hooks documentation (followup to docs: correct usage of "e.g." #14873)
• Fix missing apostrophes in test descriptions ("doesnt" → "doesn't", "isnt" → "isn't")

[changeset-bot]

⚠️ No Changeset found

Latest commit: d4c0a4c

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[svelte-docs-bot]

Preview: https://svelte-dev-git-preview-kit-15264-svelte.vercel.app/

[benmccann]

if you're going to be sending multiple PRs for typos please put them all together into a single PR