sp-core: Improve docs generated by `generate_feature_enabled_macro` #3255

Job	Run time
set-image	10s
check-runtime-migration (asset-hub-westend)	5m 33s
check-runtime-migration (asset-hub-rococo)	31m 49s
check-runtime-migration (bridge-hub-westend)	5m 22s
check-runtime-migration (bridge-hub-rococo)	5m 31s
check-runtime-migration (contracts-rococo)	9m 31s
check-runtime-migration (collectives-westend)	5m 32s
check-runtime-migration (coretime-rococo)	5m 26s
	1h 8m 54s

Provide feedback