Add docstring for block and file new method.

Author: Fernando Ojeda

SoftLayer/CLI/block/detail.py

@@ -10,6 +10,12 @@
 
 
 def get_block_volume_id(volume_id, block_manager):
+    """Returns the volume id.
+
+    :param volume_id: ID of volume.
+    :param block_manager: Block Storage Manager.
+    :return: Returns the volume id.
+    """
     storage_list = block_manager.list_block_volumes()
     for storage in storage_list:
         if volume_id == storage['username']:

SoftLayer/CLI/file/detail.py

@@ -10,6 +10,12 @@
 
 
 def get_file_volume_id(volume_id, file_manager):
+    """Returns the volume id.
+
+    :param volume_id: ID of volume.
+    :param block_manager: Block Storage Manager.
+    :return: Returns the volume id.
+    """
     storage_list = file_manager.list_file_volumes()
     for storage in storage_list:
         if volume_id == storage['username']: