Update authorization and pagination docs

[mandiwise]

Description

This PR contains updated authorization and pagination content for the Learn docs. Key changes include:

• Intro and recap formats are standardized with other updated pages
• Example resolver format has been standardized with the rest of the docs
• The postRepository code example has been expanded for clarity
• Nod to auth directives (given that this is a common pattern)
• Schema examples for connection and edge types are include on the pagination page
• Light editing throughout each page

@benjie @jorydotcom

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