Update the PKO doc page for PKOv2

[EronWright]

Update the doc page:
https://www.pulumi.com/docs/iac/packages-and-automation/continuous-delivery/pulumi-kubernetes-operator/

Also, there's a set of user guides (/docs/create-stacks-using-*.yaml) that may require an update; take a look and file followups as necessary.

[cleverguy25]

Added to epic #586

[MitchellGerdisch]

Add a section that discusses "sync" (aka pulumi up) triggers.

Being sure to cover resyncFrequencySeconds and how it relates to running a pulumi update when source code changes in git.

And, explain the relationship betweenresyncFrequencySeconds and continueResyncOnCommitMatch and how they can be used to drive periodic pulumi updates.

And describe how one can disable pulumi updates on git pushes by using commit property set to "HEAD" instead of using branch property.

And that both periodic updates and git push updates can be disabled by setting resynFrequenceSeconds to 0 and using the commit property set to "HEAD".

And, explain how the reconciliation-request annotation can be used to trigger an immediate pulumi update for the stack.
Example command: kubectl annotate stack/STACKNAME "pulumi.com/reconciliation-request=$(date)" --overwrite