Update cheatsheets

tldr/git-merge-tree

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# git merge-tree
+
+> Merge branches without changing files.
+> More information: <https://git-scm.com/docs/git-merge-tree>.
+
+- Show the result of a merge between two branches:
+
+`git merge-tree {{branch1}} {{branch2}}`
+
+- Perform a merge and write the resulting tree:
+
+`git merge-tree --write-tree {{branch1}} {{branch2}}`