fix: Add explanation of .spy.yaml. (#85)

docs/05-concepts/02-models.md

@@ -1,6 +1,6 @@
 # Working with models
 
-Models are the YAML files used to define serializable classes in Serverpod. They are used to generate Dart code for the server and client, and, if a database table is defined, to generate database code for the server. The yaml-files are located in the `lib/src/models` directory in your server project.
+Models are Yaml files used to define serializable classes in Serverpod. They are used to generate Dart code for the server and client, and, if a database table is defined, to generate database code for the server. Using regular `.yaml` files within `lib/src/models` is supported, but it is recommended to use `.spy.yaml` (.spy stands for "Server Pod Yaml") to leverage syntax highlighting provided by the [Serverpod Extension](https://marketplace.visualstudio.com/items?itemName=serverpod.serverpod) for VS Code.
 
 The files are analyzed by the Serverpod CLI when generating the project and creating migrations.
 

versioned_docs/version-1.2.0/05-concepts/02-models.md

@@ -1,6 +1,6 @@
 # Working with models
 
-Models are the YAML files used to define serializable classes in Serverpod. They are used to generate Dart code for the server and client, and, if a database table is defined, to generate database code for the server. The yaml-files are located in the `lib/src/models` directory in your server project.
+Models are Yaml files used to define serializable classes in Serverpod. They are used to generate Dart code for the server and client, and, if a database table is defined, to generate database code for the server. Using regular `.yaml` files within `lib/src/models` is supported, but it is recommended to use `.spy.yaml` (.spy stands for "Server Pod Yaml") to leverage syntax highlighting provided by the [Serverpod Extension](https://marketplace.visualstudio.com/items?itemName=serverpod.serverpod) for VS Code.
 
 The files are analyzed by the Serverpod CLI when generating the project and creating migrations.