Fix link to the "networks" page in the docs. (#2260)

Author: ElliotFriend

cookbook/tx-new.mdx

@@ -31,7 +31,7 @@ stellar network use testnet
 
 ### Create Account
 
-Creates and funds a new Stellar account. Above `alice` was funded by [friendbot](../../../learn/fundamentals/networks.mdx#friendbot). However, `bob` and `charlie` were not. So we can use the `create-account` command to fund them.
+Creates and funds a new Stellar account. Above `alice` was funded by [friendbot](../../../networks/README.mdx#friendbot). However, `bob` and `charlie` were not. So we can use the `create-account` command to fund them.
 
 `bob` will receive 10 XLM and `charlie` will get 1 XLM.