Chromium: Add redox_syscall to speaker notes for the third-party exercise. (#1571)

Speaker notes for Chromium's third-party crate exercise list the
transitive dependencies that will be downloaded during the exercise.
Before this commit the list was missing the `redox_syscall` crate.

Additionally, the commit sorts the crates to make it easier to compare
with the output of `git status` or `ls`.

---------

Co-authored-by: Martin Geisler <martin@geisler.net>

src/exercises/chromium/third-party.md

@@ -9,13 +9,25 @@ skip ahead and do that now if you like. Or, you could create a new
 [`rust_executable` target][2] which uses `uwuify`).
 
 <details>
+
 Students will need to download lots of transitive dependencies.
 
-The total crates needed are: uwuify, smallvec, scopeguard, parking_lot,
-parking_lot_core, lock_api and instant. If students are downloading even
+The total crates needed are:
+
+- `instant`,
+- `lock_api`,
+- `parking_lot`,
+- `parking_lot_core`,
+- `redox_syscall`,
+- `scopeguard`,
+- `smallvec`, and
+- `uwuify`.
+
+If students are downloading even
 more than that, they probably forgot to turn off the default features.
 
 Thanks to [Daniel Liu][3] for this crate!
+
 </detail>