add kube-context to kubectl and helm commads and fix some yaml issues

[tkircsi]

Q	A
Bug fix?	yes
New feature?	no
API breaks?	no
Deprecations?	no
Related tickets	fixes #X, partially #Y, mentioned in #Z
License	Apache 2.0

What's in this PR?

This PR contains document updates and fixes.

Why?

• fix incorrect CRs in the document
• add kube context to kubectl and helm commands

Checklist

• [ ] Implementation tested
• [x] User guide and development docs updated (if needed)