Update cheatsheets

git-var

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# git var
+
+> Prints a Git logical variable's value.
+> See `git config`, which is preferred over `git var`.
+> More information: <https://git-scm.com/docs/git-var>.
+
+- Print the value of a Git logical variable:
+
+`git var {{GIT_AUTHOR_IDENT|GIT_COMMITTER_IDENT|GIT_EDITOR|GIT_PAGER}}`
+
+- [l]ist all Git logical variables:
+
+`git var -l`