[V4] Fix jazzy docs (#1577)

## Summary
- Setting minimum iOS version to 12

Author: atmamont

Scripts/generate_documentation.sh

@@ -15,7 +15,7 @@ swift package generate-xcodeproj
 
 # Create a Podfile with our pod as dependency.
 echo "
-platform :ios, '11.0'
+platform :ios, '13.0'
 
 target '$PROJECT_NAME' do
   use_frameworks!