chore: replaced the link with avalanche

the old link was giving me an error

Signed-off-by: Radovenchyk <raddole@ukr.net>

README.md

@@ -3,7 +3,7 @@
 [![Build + Test + Release](https://github.com/ava-labs/subnet-evm/actions/workflows/lint-tests-release.yml/badge.svg)](https://github.com/ava-labs/subnet-evm/actions/workflows/lint-tests-release.yml)
 [![CodeQL](https://github.com/ava-labs/subnet-evm/actions/workflows/codeql-analysis.yml/badge.svg)](https://github.com/ava-labs/subnet-evm/actions/workflows/codeql-analysis.yml)
 
-[Avalanche](https://docs.avax.network/overview/getting-started/avalanche-platform) is a network composed of multiple blockchains.
+[Avalanche](https://docs.avax.network/avalanche-l1s) is a network composed of multiple blockchains.
 Each blockchain is an instance of a Virtual Machine (VM), much like an object in an object-oriented language is an instance of a class.
 That is, the VM defines the behavior of the blockchain.