docs: edit some titles for rpc proxy and caching

documentation/docs/pages/docs/references/rpc-node-providers.mdx

@@ -35,11 +35,11 @@ You can use [chainlist](https://chainlist.org/) to find all the providers which
 
 rindexer should work with any local nodes you run including [Anvil](https://book.getfoundry.sh/anvil/) and [Hardhat](https://hardhat.org/)
 
-# RPC Proxy and Caching
+## RPC Proxy and Caching
 
 [eRPC](https://github.com/erpc/erpc) is a fault-tolerant EVM RPC proxy and re-org aware permanent caching solution. It is built with read-heavy use-cases in mind such as data indexing and high-load frontend usage.
 
-## Quickstart
+### Setup
 
 1. Create your [`erpc.yaml`](https://docs.erpc.cloud/config/example) configuration file: