[DOCS] Rule creation enhancements checklist

[jmikell821]

Gathering all create rule enhancements into a single checklist for visibility.

• [DOCS][Rules][Data Views] - Data views available in rule creation flow #1832
• [DOCS][8.4] Fallback to @timestamp is configurable when timestamp override is defined  #2196
• [DOCS] Add DSL Filters to Event Correlation (EQL) rule creation #2208
• [DOCS] Advanced rule query preview option available #2227
• [DOCS] "New terms" rule type #2257