Add Paused Annotation Doc

[SpiritZhou]

Provide a description of what has been changed

Checklist

• Commits are signed with Developer Certificate of Origin (DCO)

Relates to kedacore/keda#4809
Relates to kedacore/keda#3304

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[tomkerkhove]

Would you mind updating the pausing section and cover both annotations and explain which one takes priority over the other please?

https://deploy-preview-1190--keda.netlify.app/docs/2.11/concepts/scaling-deployments/#pause-autoscaling

[zroubalik]

Please provide furter explanation of the behaviour when one of pausing or both of them are specified. Thanks!