Remove deprecated package_api_docs lint (#234)

Author: parlough

pkgs/analysis_defaults/lib/analysis.yaml

@@ -17,7 +17,6 @@ linter:
     - missing_code_block_language_in_doc_comment
     - no_literal_bool_comparisons
     - no_self_assignments
-    - package_api_docs
     - prefer_final_fields
     - prefer_final_in_for_each
     - prefer_final_locals