Fix link to networking section in table of contents

Author: MaxKam

README.md

@@ -120,7 +120,7 @@ If you want to be a reliability engineer or operations engineer, study more from
     - [Floating Point Numbers](#floating-point-numbers)
     - [Unicode](#unicode)
     - [Endianness](#endianness)
-- [Networking](#networking)
+    - [Networking](#networking)
 - [System Design, Scalability, Data Handling](#system-design-scalability-data-handling) (if you have 4+ years experience)
 - [Final Review](#final-review)
 - [Coding Question Practice](#coding-question-practice)