Update cheatsheets

tldr/ruff-format

@@ -0,0 +1,22 @@
+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# ruff format
+
+> An extremely fast Python code formatter.
+> If no files or directories are specified, the current working directory is used by default.
+> More information: <https://docs.astral.sh/ruff/formatter>.
+
+- Format given files or directories in-place:
+
+`ruff format {{path/to/file_or_directory1 path/to/file_or_directory2 ...}}`
+
+- Print which files would have been modified and return a non-zero exit code if there are files to reformat, and zero otherwise:
+
+`ruff format --check`
+
+- Print what changes would be made without modifying the files:
+
+`ruff format --diff`