Update cheatsheets

mr

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# mr
+
+> Manage all of your version control repositories at once.
+> More information: <https://myrepos.branchable.com>.
+
+- Register a repository:
+
+`mr register`
+
+- Update repositories in 5 concurrent jobs:
+
+`mr -j{{5}} update`
+
+- Print the status of all repositories:
+
+`mr status`
+
+- Checkout all repositories to the latest version:
+
+`mr checkout`