suggest x.py vendor instead of cargo vendor

Signed-off-by: onur-ozkan <[email protected]>

src/bootstrap/bootstrap.py

@@ -1041,7 +1041,7 @@ def check_vendored_status(self):
                             "--sync ./compiler/rustc_codegen_gcc/Cargo.toml " \
                             "--sync ./src/bootstrap/Cargo.toml "
                 eprint('ERROR: vendoring required, but vendor directory does not exist.')
-                eprint('       Run `cargo vendor {}` to initialize the '
+                eprint('       Run `x.py vendor {}` to initialize the '
                       'vendor directory.'.format(sync_dirs))
                 eprint('       Alternatively, use the pre-vendored `rustc-src` dist component.')
                 eprint('       To get a stable/beta/nightly version, download it from: ')