Update cheatsheets

rustup-run

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# rustup run
+
+> Run a command with an environment configured for a Rust toolchain.
+> Note: all commands managed by `rustup` have a shorthand for this: for example, `cargo +nightly build` is equivalent to `rustup run nightly cargo build`.
+> More information: <https://rust-lang.github.io/rustup>.
+
+- Run a command using a given Rust toolchain (see `rustup help toolchain` for more information):
+
+`rustup run {{toolchain}} {{command}}`