Update managing_templates.md

[sambellbraze]

I believe an additional point is required to actually confirm what happens to LIVE or DRAFT campaigns/canvases if a template is archived.

e.g. does that break those campaigns which have referenced the template? From my testing it doesn't break anything.

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[lydia-xie]

Hey @sambellbraze - thanks for the feedback! I've addressed your suggestions here. Closing this PR.