Add SEO descriptions to timeseries API reference pages

[mintlify]

Summary

Audited all MDX files for SEO/metadata quality (missing/short/long title and description frontmatter). Found and filled a consistent gap: 51 pages under api-reference/data/timeseries/ were missing description frontmatter, while 156 sibling api-reference pages already include one.

Added a plain-language description (50–160 characters) to each of the 51 timeseries endpoint pages. Descriptions summarize what each GET /v2/timeseries/{user_id}/<metric>/grouped endpoint returns.

Scope decisions

• Titles: All existing titles are under 60 characters. No title changes made.
• Event-catalog (192 pages): Uniform convention — none of the existing schema pages include a description. Changing the whole convention is out of scope for an SEO-gap audit and would risk inconsistency with the auto-rendered schema pattern. Left unchanged.
• Snippets (11 files): These are reusable MDX fragments (not standalone pages) and intentionally have no frontmatter. Left unchanged.

Validation

• mint validate — passed
• mint broken-links — no broken links

Only frontmatter was modified; page content is untouched.

[mintlify]

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Project	Status	Preview	Updated (UTC)
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