Fixed language codes in Metadata Syntax doc.

docs/LOOT Metadata Syntax.html

@@ -228,12 +228,10 @@ display: 'OBSE v18+'
 <code class="box">type: say
 condition: 'file("foo.esp")'
 content:
-  - lang: eng
+  - lang: en
     str: 'An example link: &lt;http://www.example.com&gt;'
-  - lang: rus
+  - lang: ru
     str: 'Это пример ссылки: &lt;http://www.example.com&gt;'
-  - lang: ger
-    str: 'Ein Beispiel-Link: &lt;http://www.example.com&gt;'
 </code>
 would be displayed as
 <blockquote>
@@ -443,6 +441,7 @@ both get displayed as
     <tbody>
         <tr><td>Chinese<td>zh_CN
         <tr><td>English<td>en
+        <tr><td>Finnish<td>fi
         <tr><td>French<td>fr
         <tr><td>Polish<td>pl
         <tr><td>Brazilian Portuguese<td>pt_BR