Update 'Building your first mod'

Building-your-first-mod.md

@@ -2,7 +2,7 @@ In a Command Prompt/terminal, run `dtmt new <path/to/new/folder>` to create a sk
 During this, DTMT will prompt for several fields, including:
    
    - `name`: The human-readable name of your mod. This will show up in various places like DTMM's mod list or DMF's mod options view.
-   - `id`: A unique ID for your mod. The default is generated from `name` and should be good enough in most cases (clicking Enter without typing accepts the default value). This will be used throughout your code (e.g. in `get_mod()` calls).
+   - `id`: A unique ID for your mod. The default is generated from `name` and should be good enough in most cases (clicking `Enter` without typing accepts the default value). This will be used throughout your code (e.g. in `get_mod()` calls).
 
 DTMT will now create the given directory from the mod template:
 
@@ -11,6 +11,7 @@ DTMT will now create the given directory from the mod template:
 └──<id>
    ├──dtmt.cfg
    ├──packages
+   │  └──mods
    │     └──<id>.package
    └──scripts
       └──mods