rustup-{install,run,which,help,man}: add page (#10661)

pages/common/rustup-help.md

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+# rustup help
+
+> Display help on `rustup` and its subcommands.
+> More information: <https://rust-lang.github.io/rustup>.
+
+- Display general help:
+
+`rustup help`
+
+- Display help for a subcommand:
+
+`rustup help {{subcommand}}`

pages/common/rustup-install.md

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+# rustup install
+
+> Install or update Rust toolchains.
+> This command is an alias of `rustup update`, but can only install/update one toolchain at a time.
+> More information: <https://rust-lang.github.io/rustup>.
+
+- Install or update a specific toolchain (see `rustup help toolchain` for more information):
+
+`rustup install {{toolchain}}`

pages/common/rustup-man.md

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+# rustup man
+
+> View the man page for a given command managed by `rustup`.
+> More information: <https://rust-lang.github.io/rustup>.
+
+- View the man page for a given command from the default toolchain:
+
+`rustup man {{command}}`
+
+- View the man page for a given command from the specified toolchain:
+
+`rustup man --toolchain {{command}}`

pages/common/rustup-run.md

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+# rustup run
+
+> Run a command with an environment configured for a given 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}}`

pages/common/rustup-which.md

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+# rustup which
+
+> Display which binary will be run for a given command managed by `rustup`.
+> Like `which`, but searches a Rust toolchain instead of `$PATH`.
+> More information: <https://rust-lang.github.io/rustup>.
+
+- Display the path to the binary in the default toolchain:
+
+`rustup which {{command}}`
+
+- Display the path to the binary in the specified toolchain (see `rustup help toolchain` for more information):
+
+`rustup which --toolchain {{toolchain}} {{command}}`