Issue #3251835 by beatrizrodrigues, joachim, mikelutz, quietone: Fix incorrect...

Issue #3251835 by beatrizrodrigues, joachim, mikelutz, quietone: Fix incorrect @return docs and description for Row::getSource()

core/modules/migrate/src/Row.php

@@ -157,10 +157,11 @@ public function getSourceProperty($property) {
   }
 
   /**
-   * Returns the whole source array.
+   * Retrieves all source properties.
    *
    * @return array
-   *   An array of source plugins.
+   *   An array containing all source property values, keyed by the property
+   *   name.
    */
   public function getSource() {
     return $this->source;