Fix typo

Author: smith558

docs/index.html

@@ -55,7 +55,7 @@ <h1 style="display: none;">A guide to Haskell programming language</h1>
                     I immediately fell in love and followed it to supplement my journey of learning Haskell.
                 </p>
                 <p>
-                    However I quickly realised some parts are slowly becoming outdated as Haskell continues to
+                    However, I quickly realised some parts are slowly becoming outdated as Haskell continues to
                     evolve. That is why, with the author's blessing, I decided to create this <em style="color: greenyellow">open-source</em>
                     fork to enable the Haskell community to participate in preserving and maintaining this awesome
                     resource for the future times.