feat: Update comments for CRP

[circy9]

Description of your changes

• Update comments of CRP
• Use the same kubebuilder annotations for all the conditions
• Add the missing "+" for some kubebuilder annotations
• Disclose the list of reserved namespaces and resource types that are not placed
• Update comments for conditions of MC to make comments consistent
• Update the list view of CRP
  Example:
  ❯ k get crp -o=custom-columns='NAME:.metadata.name,GEN:.metadata.generation,Scheduled:.status.conditions[?(@.type=="Scheduled")].status,ScheduledGEN:.status.conditions[?(@.type=="Scheduled")].observedGeneration,Applied:.status.conditions[?(@.type=="Applied")].status,AppliedGEN:.status.conditions[?(@.type=="Applied")].observedGeneration'
  NAME GEN Scheduled ScheduledGEN Applied AppliedGEN
  hello-world 3 False 3 True 2

// - reserved namespaces including: default, kube-* (reserved for Kubernetes system namespaces), fleet-* (reserved for fleet system namespaces).
// - reserved fleet resource types including: MemberCluster, InternalMemberCluster, ClusterResourcePlacement, MultiClusterService, ServiceImport, etc.

Fixes #264

I have:

• Run make reviewable to ensure this PR is ready for review.

How has this code been tested

None as this only changes comments.