Update _evm-installation.mdx

Author: yashovardhan

src/common/docs/unity-connect-blockchain/_evm-installation.mdx

@@ -1,7 +1,7 @@
 In this reference, we're using the `Nethereum` library to demonstrate how to make blockchain calls
 using it with Web3Auth.
 
-# Package installation instructions ([Official repository](https://github.com/Nethereum/Nethereum.Unity))
+### Package installation instructions ([Official repository](https://github.com/Nethereum/Nethereum.Unity))
 
 Install via **Package Manager** using OpenUpm
 
@@ -29,7 +29,7 @@ Install via **Package Manager** using OpenUpm
 
 - click **Add**
 
-# Installing package for old version
+### Installing package for old version
 
 - Download the latest `net461dllsAOT.zip` package from Nethereum's
   [latest release](https://github.com/Nethereum/Nethereum/releases)