Various code cleanup.

app/Models/RuleGroup.php

@@ -25,6 +25,8 @@ namespace FireflyIII\Models;
 use Carbon\Carbon;
 use FireflyIII\User;
 use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Illuminate\Database\Eloquent\Relations\HasMany;
 use Illuminate\Database\Eloquent\SoftDeletes;
 use Illuminate\Support\Collection;
 use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
@@ -60,16 +62,16 @@ class RuleGroup extends Model
             'order'      => 'int',
         ];
 
-    /**
-     * @var array
-     */
+    /** @var array Fields that can be filled */
     protected $fillable = ['user_id', 'order', 'title', 'description', 'active'];
 
     /**
+     * Route binder. Converts the key in the URL to the specified object (or throw 404).
+     *
      * @param string $value
      *
      * @return RuleGroup
-     * @throws \Symfony\Component\HttpKernel\Exception\NotFoundHttpException
+     * @throws NotFoundHttpException
      */
     public static function routeBinder(string $value): RuleGroup
     {
@@ -88,18 +90,18 @@ class RuleGroup extends Model
 
     /**
      * @codeCoverageIgnore
-     * @return \Illuminate\Database\Eloquent\Relations\HasMany
+     * @return HasMany
      */
-    public function rules(): \Illuminate\Database\Eloquent\Relations\HasMany
+    public function rules(): HasMany
     {
         return $this->hasMany(Rule::class);
     }
 
     /**
      * @codeCoverageIgnore
-     * @return \Illuminate\Database\Eloquent\Relations\BelongsTo
+     * @return BelongsTo
      */
-    public function user(): \Illuminate\Database\Eloquent\Relations\BelongsTo
+    public function user(): BelongsTo
     {
         return $this->belongsTo(User::class);
     }