docs: fix spelling, punctuation, and broken markdown across MDX docs

[mintlify]

Summary

Sweep of all English MDX files for spelling errors, grammatical mistakes, and broken formatting; only clear errors were corrected.

Changes

Spelling

• x-api/enterprise-gnip-2.0/fundamentals/data-dictionary.mdx — embeded → embedded.

Broken frontmatter

• enterprise-api/media/quickstart/best-practices.mdx — description field contained a truncated, malformed link ([\POST.`). Replaced with a clean, well-formed description.
• x-api/media/quickstart/best-practices.mdx — same broken description; cleaned up.

Broken markdown

• tutorials/getting-historical-posts-using-the-full-archive-search-endpoint.mdx — two empty ### heading markers were separated from their heading text by a blank line, producing empty headings. Joined into ### Building queries and ### Getting geo-tagged historical Posts.

Punctuation

• x-api/posts/counts/integrate/build-a-query.mdx and enterprise-api/posts/counts/integrate/build-a-query.mdx — added missing trailing period to the "without the tilde í or eñe" sentence.

Validation: mint validate and mint broken-links both pass.

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