Use global namespace+minor fixes

Models/WikiCategory.php

@@ -59,6 +59,9 @@ class WikiCategory implements \JsonSerializable
         $this->parent = $parent;
     }
 
+    /**
+     * {@inheritdoc}
+     */
     public function jsonSerialize() : array
     {
         return [];

Models/WikiDoc.php

@@ -127,6 +127,9 @@ class WikiDoc implements \JsonSerializable
         $this->badges[] = $badge;
     }
 
+    /**
+     * {@inheritdoc}
+     */
     public function jsonSerialize() : array
     {
         return [];

Models/WikiDocMapper.php

@@ -50,7 +50,12 @@ final class WikiDocMapper extends DataMapperAbstract
      * @var array<string, array<string, null|string>>
      * @since 1.0.0
      */
-    /*
+    /*    /**
+     * Has many relation.
+     *
+     * @var array<string, array<string, string>>
+     * @since 1.0.0
+     */
     protected static $hasMany = [
         'badges' => [
             'mapper' => BadgeMapper::class,