docs(start): Improve a bit

doc/start.md

@@ -17,18 +17,22 @@ nix run
 ## Existing project
 
 services-flake uses [process-compose-flake](https://community.flake.parts/process-compose-flake) to manage the services. Let's first import the `flake-parts` modules provided by `process-compose-flake` and `services-flake` in your flake:
+
 ```nix
 {
+  # 1. Add the inputs
   inputs.process-compose-flake.url = "github:Platonic-Systems/process-compose-flake";
   inputs.services-flake.url = "github:juspay/services-flake";
   ...
   outputs = inputs:
     inputs.flake-parts.lib.mkFlake { inherit inputs; } {
       imports = [
+        # 2. Import the flake-module
         inputs.process-compose-flake.flakeModule
       ];
       perSystem = { ... }: {
-        process-compose."default" = {
+        # 3. Create the process-compose configuration, importing services-flake
+        process-compose."myservices" = {
           imports = [
             inputs.services-flake.processComposeModules.default
           ];
@@ -37,25 +41,28 @@ services-flake uses [process-compose-flake](https://community.flake.parts/proces
     };
 }
 ```
+
 As an example, let's add the `redis` service to your flake:
+
 ```nix
-# Inside `perSystem.process-compose.default`
+# Inside `perSystem.process-compose."myservices"`
 {
   services.redis."r1".enable = true;
 }
 ```
 
 Time to run the service:
+
 ```sh
-nix run
+nix run .#myservices
 ```
 
 ## Under the hood
 
 - The `services-flake` module configures [process settings](https://community.flake.parts/process-compose-flake#usage) for a service. In simple terms, it handles stuff like health checks, restart policies, setup scripts, etc. by using the easy to configure APIs provided by `process-compose-flake`.
-- The `process-compose-flake` module uses these settings to generate `packages.${system}.default`[^how-default] (`nix run` above, runs this package by default), which runs [process-compose](https://github.com/F1bonacc1/process-compose) with the generated YAML configuration[^sample-config].
+- The `process-compose-flake` module uses these settings to generate `packages.${system}.myservices`[^how-default] (`nix run .#myservices` above, [runs](https://nixos.asia/en/nix-first#run) this package by default), which runs [process-compose](https://github.com/F1bonacc1/process-compose) with the generated YAML configuration[^sample-config].
 
-[^how-default]: `default` is the name of the process group that is derived from `process-compose.<name>` in `perSystem.process-compose`.
+[^how-default]: `myservices` is the name of the process group that is derived from `process-compose.<name>` in `perSystem.process-compose`.
 
 [^sample-config]: See the example configuration from the [getting started](https://f1bonacc1.github.io/process-compose/intro/) section of the process-compose docs.