comment out dependency overrides in example pubspec

Also add a little explainer

example/pubspec.yaml

@@ -40,11 +40,17 @@ dependencies:
   platform: ^3.1.0
   device_info_plus: ^9.0.2
 
-dependency_overrides:
-  maplibre_gl_platform_interface:
-    path: ../maplibre_gl_platform_interface
-  maplibre_gl_web:
-    path: ../maplibre_gl_web
+
+# The following lines can be useful if you make changes to this plugin (specifically to the two sub-plugins), 
+# e.g. because you contribute to the project.
+# Uncommenting the following lines will cause your local versions of the sub-plugins to be used,
+#  instead of the hosted ones.
+
+# dependency_overrides:
+#   maplibre_gl_platform_interface:
+#     path: ../maplibre_gl_platform_interface
+#   maplibre_gl_web:
+#     path: ../maplibre_gl_web
 
 dev_dependencies:
   flutter_lints: ^2.0.1