Update cheatsheets

iconv

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# iconv
+
+> Converts text from one encoding to another.
+> More information: <https://manned.org/iconv>.
+
+- Convert file to a specific encoding, and print to `stdout`:
+
+`iconv -f {{from_encoding}} -t {{to_encoding}} {{input_file}}`
+
+- Convert file to the current locale's encoding, and output to a file:
+
+`iconv -f {{from_encoding}} {{input_file}} > {{output_file}}`
+
+- List supported encodings:
+
+`iconv -l`