Update docs on {node,sequence}-level caching

[rmloveland]

Fixes DOC-14041

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Files changed:

• src/current/v25.3/alter-sequence.md
• src/current/v25.3/create-sequence.md
• src/current/v25.3/understand-hotspots.md
• src/current/v25.4/alter-sequence.md
• src/current/v25.4/create-sequence.md
• src/current/v25.4/understand-hotspots.md

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[rmloveland]

hi @bghal figured you would be the right reviewer for these docs since you wrote https://github.com/cockroachdb/cockroach/pull/148290

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[rmloveland]

LGTM pending suggestions.

Also, please modify /v25.4/understand-hotspots.md by changing the hash from #cache-sequence-values-in-memory to #cache-sequence-values-in-memory-per-node

Thanks Florence! Also fixed the link in 'Understand Hotspots'

PS backported these changes to v25.3 as well since that's the version label on the PR: https://github.com/cockroachdb/cockroach/pull/148290