Fixed some broken markdowns

[koki-develop]

I found some broken markdowns and have fixed them.

• https://argoproj.github.io/argo-events/eventsources/setup/gcp-pub-sub/#setup
• https://argoproj.github.io/argo-events/eventsources/setup/redis-streams/#event-structure
• https://argoproj.github.io/argo-events/sensors/filters/expr/#practical-example
• https://argoproj.github.io/argo-events/sensors/filters/data/#practical-examples-comparator
• https://argoproj.github.io/argo-events/sensors/filters/script/#practical-example
• https://argoproj.github.io/argo-events/sensors/filters/ctx/#practical-example
• https://argoproj.github.io/argo-events/sensors/filters/time/#practical-example

Checklist:

• My organization is added to USERS.md.

[whynowy]

Thanks for fixing these!