Rename selection to options as per the changes

docs/ref/api/classification.md

 # Classification
 
 ::: arkindex_worker.worker.classification
-    selection:
+    options:
       members: no
 
 ::: arkindex_worker.worker.classification.ClassificationMixin

docs/ref/api/element.md

 # Element
 
 ::: arkindex_worker.worker.element
-    selection:
+    options:
       members:
         - ElementType
         - MissingTypeError

docs/ref/api/entity.md

 # Entity
 
 ::: arkindex_worker.worker.entity
-    selection:
+    options:
       members:
         - EntityType
     options:

docs/ref/api/metadata.md

 # Metadata
 
 ::: arkindex_worker.worker.metadata
-    selection:
+    options:
       members:
         - MetaType
     options:

docs/ref/api/training.md

 # Training
 
 ::: arkindex_worker.worker.training
-    selection:
+    options:
       members:
         - DirPath
         - Hash

docs/ref/api/transcription.md

 # Transcription
 
 ::: arkindex_worker.worker.transcription
-    selection:
+    options:
       members:
         - TextOrientation
     options:

docs/ref/api/worker_version.md

 # WorkerVersion
 
 ::: arkindex_worker.worker.version
-    selection:
+    options:
       members: no
     options:
       show_category_heading: no