Update cheatsheets

rustup-component

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# rustup component
+
+> Modify a toolchain's installed components.
+> Without the `--toolchain` option `rustup` will use the default toolchain. See `rustup help toolchain` for more information about toolchains.
+> More information: <https://rust-lang.github.io/rustup>.
+
+- Add a component to a toolchain:
+
+`rustup component add --toolchain {{toolchain}} {{component}}`
+
+- Remove a component from a toolchain:
+
+`rustup component remove --toolchain {{toolchain}} {{component}}`
+
+- List installed and available components for a toolchain:
+
+`rustup component list --toolchain {{toolchain}}`
+
+- List installed components for a toolchain:
+
+`rustup component list --toolchain {{toolchain}} --installed`