suggestion to remove the double quotes "" from the network RPC URLs

**Minor note**: The examples of network RPC URLs currently include double quotes " ". This might mislead developers into including those quotes in the URL itself, causing an error such as “ProviderError: relative URL without a base.” It would help to remove or clarify the quotes to avoid confusion.

```
ETHEREUM_SEPOLIA_RPC_URL=""
OPTIMISM_SEPOLIA_RPC_URL=""

```