SQC-352 SQC-353 create cert command documantion for mtls/CA cert chain management

[Ltadrian]

…n management

Summary

Adds documentation for new wrangler command cert

Screenshots (optional)

Documentation checklist

• The documentation style guide has been adhered to.
• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.
• Files which have changed name or location have been allocated redirects.

[ToriLindsay]

@Ltadrian I left a few grammar/spelling suggestions. Then please go ahead and merge if you're ready. Thanks!

[Ltadrian]

@Ltadrian I left a few grammar/spelling suggestions. Then please go ahead and merge if you're ready. Thanks!

Thank you Lori for the suggestions, they have been applied. I actually don't have access/capability to merge. Would you be able to on my behalf? Thank you!

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