Update cheatsheets

git-pr

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# git pr
+
+> Check out GitHub pull requests locally.
+> Part of `git-extras`.
+> More information: <https://github.com/tj/git-extras/blob/master/Commands.md#git-pr>.
+
+- Check out a specific pull request:
+
+`git pr {{pr_number}}`
+
+- Check out a pull request from a specific remote:
+
+`git pr {{pr_number}} {{remote}}`
+
+- Check out a pull request from its URL:
+
+`git pr {{url}}`
+
+- Clean up old pull request branches:
+
+`git pr clean`