Change "duck's" to "ducks" for grammar correction.

I like the site and the idea to use the domain. I'm really new to programming, and I saw a link to your page on /r/learnprogramming.

index.md

@@ -16,7 +16,7 @@ The rubber duck debugging method is as follows:
 *Original Credit*: ~Andy from lists.ethernal.org
 
 ## FAQs
-- **If duck's are so smart, why don't we just let the ducks do all the work?**
+- **If ducks are so smart, why don't we just let the ducks do all the work?**
 It would be wonderful if this were true, but the fact is that most duck's prefer to take a mentoring role. There are a few ducks however that do choose to code, but these are the duck's that nobody hears about because they are selected for secret government projects that are highly classified in nature.
 
 - **Where can I learn more about rubber duck debugging?**