Add missing time-series aggs to documentation

[kkrik-es]

Includes docs for delta, increase, idelta, irate.

Also, changes time-series agg names to be uppercase in examples.

[github-actions]

🔍 Preview links for changed docs

• docs/reference/query-languages/esql/functions-operators/time-series-aggregation-functions.md
• docs/reference/query-languages/esql/kibana/docs/functions/absent_over_time.md
• docs/reference/query-languages/esql/kibana/docs/functions/avg_over_time.md
• docs/reference/query-languages/esql/kibana/docs/functions/count_distinct_over_time.md
• docs/reference/query-languages/esql/kibana/docs/functions/count_over_time.md
• docs/reference/query-languages/esql/kibana/docs/functions/delta.md
• docs/reference/query-languages/esql/kibana/docs/functions/first_over_time.md
• docs/reference/query-languages/esql/kibana/docs/functions/idelta.md
• docs/reference/query-languages/esql/kibana/docs/functions/increase.md
• docs/reference/query-languages/esql/kibana/docs/functions/irate.md

More links …

• docs/reference/query-languages/esql/kibana/docs/functions/last_over_time.md
• docs/reference/query-languages/esql/kibana/docs/functions/max_over_time.md
• docs/reference/query-languages/esql/kibana/docs/functions/min_over_time.md
• docs/reference/query-languages/esql/kibana/docs/functions/present_over_time.md
• docs/reference/query-languages/esql/kibana/docs/functions/rate.md
• docs/reference/query-languages/esql/kibana/docs/functions/sum_over_time.md

[github-actions]

ℹ️ Important: Docs version tagging

👋 Thanks for updating the docs! Just a friendly reminder that our docs are now cumulative. This means all 9.x versions are documented on the same page and published off of the main branch, instead of creating separate pages for each minor version.

We use applies_to tags to mark version-specific features and changes.

Expand for a quick overview

When to use applies_to tags:

✅ At the page level to indicate which products/deployments the content applies to (mandatory)
✅ When features change state (e.g. preview, ga) in a specific version
✅ When availability differs across deployments and environments

What NOT to do:

❌ Don't remove or replace information that applies to an older version
❌ Don't add new information that applies to a specific version without an applies_to tag
❌ Don't forget that applies_to tags can be used at the page, section, and inline level

🤔 Need help?

• Check out the cumulative docs guidelines
• Reach out in the #docs Slack channel

[elasticsearchmachine]

Pinging @elastic/es-storage-engine (Team:StorageEngine)

[elasticsearchmachine]

Pinging @elastic/core-docs (Team:Docs)

[leemthompo]

LGTM with one question

I also noticed that a lot of the examples mix lower-case and upper-case syntax, we try to use UPPER CASE exclusively, but I understand if that's out of scope for your PR

Thanks again @kkrik-es

[leemthompo]

same nitty alphabetization question 😄

[kkrik-es]

Yeah good call, thought to group the i* functions together.. fixed.

[kkrik-es]

I also noticed that a lot of the examples mix lower-case and upper-case syntax, we try to use UPPER CASE exclusively, but I understand if that's out of scope for your PR

We did miss that! I added updates for these - many files touched but the deltas are small.

[elasticsearchmachine]

💚 Backport successful

Status	Branch	Result
✅	9.2