Explain usage of `<T: Config>` in FRAME storage + Update parachain pa… #6

Job	Run time
check-dependency-rules	9s
check-workspace	18s
set-image	8s
check-markdown	15s
fmt	1m 26s
check-toml-format	1m 7s
check-rust-feature-propagation	2m 39s
check-umbrella	2m 21s
test-rust-features	2m 5s
	10m 28s

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