1. (Human Geography) of, relating to, situated in, or inhabiting a suburb or the suburbs. 2. (Human Geography) characteristic of or typifying a suburb or the suburbs. 3. censorious narrow or unadventurous in outlook.
Definition of supersede for English Language Learners. : to take the place of (someone or something that is old, no longer useful, etc.) : to replace (someone or something)
It is basically a fancy way of saying replacement indictment. There are a lot of possible reasons why a prosecutor would supersede. My answer to your question is based on the facts that you provide in your question. Additional factual details about your situation could change my answer completely.