docs: add dynamic links to PRs for review docs

src/beeware_docs_tools/shared_content/en/_shared/contribute/what/review-pr.md

@@ -12,6 +12,20 @@ Yes! You can offer a review on any pull request you see open on {{ formal_name }
 
 As a first-time contributor, you should feel free to review any pull request you find, even if it was submitted by a core team member. If you're a novice, you might be missing some larger project context; but we aim to keep the codebase approachable regardless of your level of experience. If there's something in the code that doesn't make sense, that might indicate there's a need for more documentation (either in the code, or as standalone design documentation).
 
+### What is ready for review
+
+The simplest way to find open pull requests is to go to the project's pull requests page: https://github.com/beeware/{{project_name}}/pulls
+
+You can use the GitHub Search functionality to find any open pull requests for a project.
+
+For example:
+
+* [All open PRs, with passing tests for {{formal_name}}](https://github.com/search?q=org%3Abeeware+repo%3A{{project_name}}+is%3Apr+state%3Aopen+status%3Asuccess+draft%3Afalse+review%3Arequired&type=pullrequests&s=created&o=asc)
+* [All open PRs, with passing tests for all projects](https://github.com/search?q=org%3Abeeware+is%3Apr+state%3Aopen+status%3Asuccess+draft%3Afalse+review%3Arequired&type=pullrequests&s=created&o=asc)
+* [All open PRs across BeeWare](https://beeware.org/b/review)
+
+Note: Not all BeeWare repos have CI tests, and not all open PRs were created when PRs had tests.
+
 ## Contributing a pull request review
 
 /// details-abstract | Providing a pull request review