bootstrap: update clippy subcmd decription

Clarify where the clippy used in `./x.py clippy` is coming from.
It uses whatever clippy binary was installed via rustup, cargo-install
or otherwise and does NOT use the binary generated by `./x.py build src/tools/clippy`.

src/bootstrap/flags.rs

@@ -104,7 +104,7 @@ pub fn parse(args: &[String]) -> Flags {
 Subcommands:
     build       Compile either the compiler or libraries
     check       Compile either the compiler or libraries, using cargo check
-    clippy      Run clippy
+    clippy      Run clippy (uses rustup/cargo-installed clippy binary)
     fix         Run cargo fix
     fmt         Run rustfmt
     test        Build and run some test suites