Update cheatsheets

git-fsck

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# git fsck
+
+> Verify the validity and connectivity of nodes in a Git repository index.
+> Does not make any modifications. See `git gc` for cleaning up dangling blobs.
+> More information: <https://git-scm.com/docs/git-fsck>.
+
+- Check the current repository:
+
+`git fsck`
+
+- List all tags found:
+
+`git fsck --tags`
+
+- List all root nodes found:
+
+`git fsck --root`