Revert "Fix non-matching defaults in docs (#5446)"

This reverts commit a978bff2c7.

plugins/modules/cloud/profitbricks/profitbricks.py

@@ -38,7 +38,6 @@ options:
       - Public SSH keys allowing access to the virtual machine.
     type: list
     elements: str
-    default: []
   datacenter:
     description:
       - The datacenter to provision this virtual machine.
@@ -75,7 +74,6 @@ options:
       - list of instance ids, currently only used when state='absent' to remove instances.
     type: list
     elements: str
-    default: []
   count:
     description:
       - The number of virtual machines to create.

plugins/modules/cloud/profitbricks/profitbricks_volume.py

@@ -50,7 +50,7 @@ options:
       - Public SSH keys allowing access to the virtual machine.
     type: list
     elements: str
-    default: []
+    required: false
   disk_type:
     description:
       - The disk type of the volume.
@@ -81,7 +81,7 @@ options:
       - list of instance ids, currently only used when state='absent' to remove instances.
     type: list
     elements: str
-    default: []
+    required: false
   subscription_user:
     description:
       - The ProfitBricks username. Overrides the PB_SUBSCRIPTION_ID environment variable.