Remove deprecated lint

Author: parlough

_analysis_config/lib/analysis_options.yaml

@@ -27,7 +27,6 @@ linter:
     - literal_only_boolean_expressions
     - omit_local_variable_types
     - only_throw_errors
-    - package_api_docs
     - package_prefixed_library_names
     - prefer_final_in_for_each
     - prefer_final_locals