Update PHP documentation for method

[wing328]

This PR updates code comment with better documentation on method name as follows:

  /**
   * updatePetWithForm
   *
   * Updates a pet in the store with form data
   *
   * @param string $pet_id ID of pet that needs to be updated (required)
   * @param string $name Updated name of the pet (required)
   * @param string $status Updated status of the pet (required)
   * @return void
   */
   public function updatePetWithForm($pet_id, $name, $status) {

This PR also replaces tab with 2 spaces in PHP API template