Fix bad links (#4231)

The solochain template links to parachain template instead of solochain.

templates/solochain/README.md

@@ -4,10 +4,10 @@ A fresh [Substrate](https://substrate.io/) node, ready for hacking :rocket:
 
 A standalone version of this template is available for each release of Polkadot
 in the [Substrate Developer Hub Parachain
-Template](https://github.com/substrate-developer-hub/substrate-parachain-template/)
+Template](https://github.com/substrate-developer-hub/substrate-node-template/)
 repository. The parachain template is generated directly at each Polkadot
-release branch from the [Node Template in
-Substrate](https://github.com/paritytech/polkadot-sdk/tree/master/substrate/bin/node-template)
+release branch from the [Solochain Template in
+Substrate](https://github.com/paritytech/polkadot-sdk/tree/master/templates/solochain)
 upstream
 
 It is usually best to use the stand-alone version to start a new project. All