Device assurance policy: update policies concept doc

[brentschaus-okta]

Description:

• What's changed? Adds device assurance policies to the policies concept doc.
• Is this PR related to a Monolith release? Nein.

Resolves:

• OKTA-843906

[acrolinxdevdocs-okta]

Acrolinx score

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Article	Total score Required:80	Word and phrases (Brand, terms) Preferred: 80	Correctness (Spelling, grammar) Preferred: 80	Clarity (Readability) Preferred: 80	Inclusive language (+ accesibility) Preferred: 80
✅ packages/@okta/vuepress-site/docs/concepts/policies/index.md	82	65	79	67	100

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