Update docs to indicate that healthcheck is performed for skaffold apply

[dorbin]

Expected behavior

Documentation should indicate that healthcheck is performed for skaffold apply.

Actual behavior

Doc references healthcheck as if only included in processing of skaffold deploy.

Information

• Skaffold version:
• Operating system:
• Installed via:
• Contents of skaffold.yaml:

<paste your skaffold.yaml here>

Steps to reproduce the behavior

1. a clonable repository with the sample skaffold project
2. skaffold <command>
3. ...

[nkubala]

thanks for pointing this out @dorbin, our documentation is in constant need of love 🙂