docs: Change polkadot-fast description

Author: galin-s

README.md

@@ -29,9 +29,9 @@ via one of the flake output categories:
 | [leap]([leap-url])                       | C++ implementation of the Antelope protocol                                                                             | x86_64-linux                                |
 | [go-opera]([go-opera-url])               | Opera blockchain protocol secured by the Lachesis consensus algorithm                                                   | x86_64-linux, x86_64-darwin, aarch64-darwin |
 | [polkadot]([polkadot-url])               | Polkadot Node Implementation                                                                                            | x86_64-linux, x86_64-darwin, aarch64-darwin |
-| polkadot-fast                            | fast-runtime = [ "polkadot-cli/fast-runtime" ]                                                                          | x86_64-linux, x86_64-darwin, aarch64-darwin |
+| polkadot-fast                            | https://github.com/paritytech/polkadot/blob/52209dcfe546ff39cc031b92d64e787e7e8264d4/Cargo.toml#L228                    | x86_64-linux, x86_64-darwin, aarch64-darwin |
 
-2. ZK Circuit-related Software
+1. ZK Circuit-related Software
 
 | package name                           | description                                                                | supported platforms                         |
 |----------------------------------------|----------------------------------------------------------------------------|---------------------------------------------|