[placement] Fix parameter order in placement API ref

Optional parameters should be after required paramenters.
Parameters added in microversions should be after
original parameters.
So fix them.

Change-Id: I5e3f5df5601d3747debed273e09a8b9b18046a96
Closes-Bug: #1728557

placement-api-ref/source/inventories.inc

@@ -62,12 +62,12 @@ Request
   - uuid: resource_provider_uuid_path
   - resource_provider_generation: resource_provider_generation
   - inventories: inventories
+  - total: total
   - allocation_ratio: allocation_ratio_opt
   - max_unit: max_unit_opt
   - min_unit: min_unit_opt
   - reserved: reserved_opt
   - step_size: step_size_opt
-  - total: total
 
 Request example
 ---------------

placement-api-ref/source/inventory.inc

@@ -63,12 +63,12 @@ Request
   - uuid: resource_provider_uuid_path
   - resource_class: resource_class_path
   - resource_provider_generation: resource_provider_generation
+  - total: total
   - allocation_ratio: allocation_ratio_opt
   - max_unit: max_unit_opt
   - min_unit: min_unit_opt
   - reserved: reserved_opt
   - step_size: step_size_opt
-  - total: total
 
 Request example
 ---------------

placement-api-ref/source/resource_providers.inc

@@ -24,10 +24,10 @@ of all filters are merged with a boolean `AND`.
 
 .. rest_parameters:: parameters.yaml
 
-  - resources: resources_query
-  - member_of: member_of
-  - uuid: resource_provider_uuid_query
   - name: resource_provider_name_query
+  - uuid: resource_provider_uuid_query
+  - member_of: member_of
+  - resources: resources_query
 
 Response
 --------