Add Pull Requests to docs

[itaigilo]

Closes #8293.

Change Description

Adding Pull Requests to the docs (in the "How To" section).

This blog post was used as a reference.

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:recycle: PR Preview fa1dc3828d9ac1d860bf27c31cf08b80665577b7 has been successfully destroyed since this PR has been closed.

_{🤖 By surge-preview}

[github-actions[bot]]

E2E Test Results - DynamoDB Local - Local Block Adapter

[github-actions[bot]]

E2E Test Results - Quickstart