config/docs: update and deprecated (#6879)

## Description

- Add deprecated to config values in toml
- update config in configuration doc
- explain how to set up a node with the new network

- add sentence about not needing to fork tendermint for built-in tutorial
 - closes #6865 
- add note to use a released version of tendermint with the tutorials. This is to avoid unknown issues prior to a release.

docs/tutorials/go-built-in.md

@@ -23,6 +23,8 @@ yourself with the syntax.
 By following along with this guide, you'll create a Tendermint Core project
 called kvstore, a (very) simple distributed BFT key-value store.
 
+> Note: please use a released version of Tendermint with this guide. The guides will work with the latest version. Please, do not use master. 
+
 ## Built-in app vs external app
 
 Running your application inside the same process as Tendermint Core will give
@@ -50,10 +52,13 @@ We'll start by creating a new Go project.
 ```bash
 mkdir kvstore
 cd kvstore
+go mod init github.com/<github_username>/<repo_name>
 ```
 
 Inside the example directory create a `main.go` file with the following content:
 
+> Note: there is no need to clone or fork Tendermint in this tutorial. 
+
 ```go
 package main