docs: (#3137) show 'apply yaml' either from stdin, or from file using… #3223
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What type of PR is this?
What this PR does / why we need it:
this is a convenience in the docs. oftentimes it's really nice to be able to show yaml with code highlighting for ease of legibility, but it's also convenient to provide a kubectl apply -f command that can copy-paste directly into the shell.
Which issue(s) this PR fixes:
Fixes #3137