spellcheck: Add Tokio to dictionary

This PR adds Tokio as part of our spell check dictionary as this
is part of Rust.

Fixes #5378

Signed-off-by: Gabriela Cervantes <[email protected]>

Author: GabyCT

cmd/check-spelling/data/projects.txt

@@ -85,6 +85,7 @@ SQLite/B
 SUSE/B
 systemd/B
 TravisCI/B
+Tokio/B
 Vexxhost/B
 virtcontainers/B
 VMWare/B