Update index.md

Author: kianenigma

content/md/en/docs/polkadot-sdk/index.md

@@ -32,8 +32,8 @@ Note that **this does not impact the development of Substrate as a framework**.
 
 Below, you can find a number of replacement resources to learn more about Polkadot SDK:
 
-- [Polkadot Wiki](https://wiki.polkadot.network/docs/build-guide)
-- [Polkadot Developers](https://github.com/polkadot-developers/)
+- [Polakdot Docs](https://docs.polkadot.com)
+- [Polkadot Wiki](https://wiki.polkadot.network)
 - [Polkadot Blockchain Academy](https://polkadot.com/blockchain-academy)
 - [Polkadot SDK Rust Docs](https://paritytech.github.io/polkadot-sdk/master/polkadot_sdk_docs/index.html)
-- Polkadot Ecosystem Documentation by Papermoon (Work in progress, see progress [here](https://forum.polkadot.network/t/decentralized-futures-papermoon-first-updates/9265))
+- [Polkadot Developers](https://github.com/polkadot-developers/)