More command examples
I had trouble finding the `toolchain uninstall` command, because I didn't realize that each subcommand had their own help pages to check on. This should hopefully make it clearer for somebody in the same situation.
Closes
@@ -519,6 +519,8 @@ Command | Description
`rustup override set nightly-2015-04-01` | For the current directory, use a nightly from a specific date
`rustup toolchain link my-toolchain "C:\RustInstallation"` | Install a custom toolchain by symlinking an existing installation
`rustup show` | Show which toolchain will be used in the current directory
+`rustup toolchain uninstall nightly` | Uninstall a given toolchain
+`rustup toolchain help` | Show the `help` page for a subcommand (like `toolchain`) to see what actions are available on it
## Environment variables
