Merge pull request #112 from brian-n-millar/1.9.x

Make step 3 in Introduction doc clearer for MVC users

docs/book/intro.md

@@ -38,14 +38,19 @@ you will need to do the following:
     ```php
     // config/autoload/dependencies.global.php:
     return [
-        'dependencies' => [
+        '<container config identifier>' => [
             'factories' => [
                 MyNamespace\Command\MyCommand::class => MyNamespace\Command\MyCommandFactory::class,
             ],
         ],
     ];
     ```
 
+    > ### Container Config Identifier
+    >
+    > - for **Laminas MVC** projects, this has to be `service_manager`
+    > - for **Mezzio** projects, this has to be `dependencies`
+
 4. Register the command with the CLI tooling:
 
     ```php