Replace stray documentation references to entity_create()

Follow-up to #2490966: [Meta] Replace deprecated usage of entity_create with a direct call to the entity type class

Problem/Motivation

According to #2346261: Deprecate entity_create() in favor of a <EntityType>::create($values) or \Drupal::entityManager()->getStorage($entity_type)->create($values), entity_create() function is now deprecated so we shouldn't use it anymore. When the entity type is known we should directly call <EntityType>::create(). When the entity type is variable, we should use \Drupal::entityManager()->getStorage($entity_type)->create($values);.

So we should replace all stray documentation references.

Beta phase evaluation

Proposed resolution

Replace stray documentation references to entity_create().

Remaining tasks

User interface changes

None.

API changes

None.