fix: playbook parameter docs

[adityathebe]

resolves: #224

not sure exactly what #224 was pointing to but I have made some improvements.

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[moshloop]

Can we add snippet examples for each of the param types?

And maybe use a kitchen sink example with all options:

flanksource/mission-control@96c658f

[moshloop]

@adityathebe - Can you also check any vale lint errors ? We probably need to force value to exit on error, and only run it on changed files with something like: https://github.com/marketplace/actions/changed-files

[adityathebe]

@moshloop added vale checks on changed files.

Added few more words on the ignore list and sorted it.