Add dependencies to docs example (#1343)
Add dependencies to docs example (#1343)

* Add dependencies to docs example

* Change codeblock type to toml

* Clarify the need for actix-rt

Co-authored-by: Yuki Okushi <85857f4af0f1ba28967e979a9055a2f74102998d@gmail.com>

actix/actix-web,actix/actix-web,actix/actix-web