Update cheatsheets

afconvert

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# afconvert
+
+> Convert between AFF and raw file formats.
+> More information: <https://manned.org/afconvert.1>.
+
+- Use a specific extension (default: `aff`):
+
+`afconvert -a {{extension}} {{path/to/input_file}} {{path/to/output_file1 path/to/output_file2 ...}}`
+
+- Use a specific compression level (default: `7`):
+
+`afconvert -X{{0..7}} {{path/to/input_file}} {{path/to/output_file1 path/to/output_file2 ...}}`