docs: update examples/README.md — remove references to deleted v1beta1 examples #9499

Summary

examples/README.md still references v1beta1 example files that no longer exist. The examples/v1beta1/ directory has been removed, but the README still instructs users to run:

kubectl apply -f examples/v1beta1/taskruns/task-output-image.yaml
kubectl apply -f examples/v1beta1/pipelineruns/pipelinerun.yaml
kubectl apply -f examples/v1beta1/pipelineruns/output-pipelinerun.yaml
kubectl apply -f examples/v1beta1/taskruns/git-resource.yaml

Only examples/v1/ exists now.

What to do

1. Update all example commands to reference examples/v1/ equivalents
2. Remove any remaining references to v1beta1 examples
3. Optionally: modernize the README to highlight the most useful/representative examples

File to edit

• examples/README.md

/kind documentation