Add constant case to config migration tables

- Remove triple points in config example

doc/Config.md

@@ -134,6 +134,16 @@ $a->config["key"] = "value";
 'config' => [
 	'key' => 'value',
 ],
+</pre></td>
+		</tr>
+		<tr>
+            <td><pre>
+$a->config['register_policy'] = REGISTER_CLOSED;
+</pre></td>
+                    <td><pre>
+'config' => [
+    'register_policty' => REGISTER_CLOSED,
+],
 </pre></td>
         </tr>
 		<tr>
@@ -223,6 +233,17 @@ key = value
 'section' => [
 	'key' => 'value',
 ],
+</pre></td>
+		</tr>
+		<tr>
+            <td><pre>
+[config]
+register_policty = REGISTER_CLOSED
+</pre></td>
+        			<td><pre>
+'config' => [
+    'register_policty' => REGISTER_CLOSED,
+],
 </pre></td>
         </tr>
 		<tr>
@@ -250,7 +271,6 @@ If you need to specify a port to access the database, you can do so by appending
 
     'database' => [
         'hostname' => 'your.mysqlhost.com:123456',
-        ...
     ]
 
 If all of the following environment variables are set, Friendica will use them instead of the previously configured variables for the db: