Document per-resource poll interval and reconcile-request annotations

[yordis]

• Crossplane now supports two new annotations (crossplane.io/poll-interval and crossplane.io/reconcile-requested-at) that give operators fine-grained control over reconciliation behavior on a per-resource basis, introduced in Add per-resource poll interval and reconcile-now annotations crossplane#7239
• Without per-resource control, operators had to choose a single global poll interval that was either too aggressive for stable resources or too slow for dynamic ones
• The reconcile-request annotation follows the Flux CD pattern, providing a way to trigger immediate re-sync without modifying a resource's spec

Fixes #1082

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[adamwg]

lgtm once the line numbers are corrected. Thanks for the writeup!