feat: add new section in iexec-explorer.md to describe available chains and SRLC/RLC features

Author: Le-Caignec

README.md

@@ -170,5 +170,5 @@ Fork this repository and ensure you're working on the `main` branch:
 - Add a Development workflow
 - Update context7 when doc will be deployed
 - Check theGraph Images with design Team
-- Add section iexec-explorer.md file to talk about: available chain + SRLC/RLC
+- Add new section in `iexec-explorer.md` file to talk about: available chain on the UI + SRLC/RLC on account section
   feature of the protocol