Debian Testing is now also providing recent Rust releases (outside of
the freeze period), like Debian Unstable (Sid).
Thus add it to the list.
Cc: Fabian Grünbichler <debian@fabian.gruenbichler.email>
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
Debian
******
-Debian Unstable (Sid), outside of the freeze period, provides recent Rust
-releases and thus it should generally work out of the box, e.g.::
+Debian Testing and Debian Unstable (Sid), outside of the freeze period, provide
+recent Rust releases and thus they should generally work out of the box, e.g.::
apt install rustc rust-src bindgen rustfmt rust-clippy