🅰️ Typo fix

Author: dumindu

source/docs/a1.why_rust.md

@@ -38,7 +38,7 @@ Rust compiler observes the code **at compile-time** and helps to [**prevent many
 
 ## Before going to the next...
 
-- The following guilds will be helpful for you to understand the maturity of the Rust ecosystem and the tools you need to choose, according to the area you want to master.
+- The following guides will be helpful for you to understand the maturity of the Rust ecosystem and the tools you need to choose, according to the area you want to master.
   - [Are we web yet?](http://www.arewewebyet.org/)
   - [Are we game yet?](http://arewegameyet.com/)
   - [Are we learning yet?](http://www.arewelearningyet.com/)