add docs

docs/core/cli.md

@@ -60,7 +60,13 @@ The root command (called `rootCmd`) is what the user first types into the comman
 
 Next is an example `rootCmd` function from the `simapp` application. It instantiates the root command, adds a [_persistent_ flag](#flags) and `PreRun` function to be run before every execution, and adds all of the necessary subcommands.
 
-+++ https://github.com/cosmos/cosmos-sdk/blob/v0.40.0/simapp/simd/cmd/root.go#L37-L93
++++ https://github.com/cosmos/cosmos-sdk/blob/e73c64bac3392084d47e96a5b49eb7c1b5274ea8/simapp/simd/cmd/root.go#L37-L150
+
+`rootCmd` has a function called `initAppConfig()` which is useful for setting the application's custom configs.
+By default app uses Tendermint app config template from SDK, which can be over-written via `initAppConfig()`.
+Here's an example code to override default `appConfig` and `app.toml` template.
+
++++ https://github.com/cosmos/cosmos-sdk/blob/e73c64bac3392084d47e96a5b49eb7c1b5274ea8/simapp/simd/cmd/root.go#L84-L117
 
 The root-level `status` and `keys` subcommands are common across most applications and do not interact with application state. The bulk of an application's functionality - what users can actually _do_ with it - is enabled by its `tx` and `query` commands.
 

simapp/simd/cmd/root.go

@@ -67,7 +67,7 @@ func NewRootCmd() (*cobra.Command, params.EncodingConfig) {
 				return err
 			}
 
-			customAppTemplate, customAppConfig := initConfig()
+			customAppTemplate, customAppConfig := initAppConfig()
 
 			return server.InterceptConfigsPreRunHandler(cmd, customAppTemplate, customAppConfig)
 		},
@@ -78,9 +78,9 @@ func NewRootCmd() (*cobra.Command, params.EncodingConfig) {
 	return rootCmd, encodingConfig
 }
 
-// initConfig helps to override default appConfig template and configs.
+// initAppConfig helps to override default appConfig template and configs.
 // return "", nil if no custom configuration is required for the application.
-func initConfig() (string, interface{}) {
+func initAppConfig() (string, interface{}) {
 	// The following code snippet is just for reference.
 
 	// WASMConfig defines configuration for the wasm module.