Remove comments on cross-contract reentrancy venerability (#308) #1002

Job	Run time
build-sway-lib	3m 7s
build-forc-doc-sway-libs	38s
contributing-book (docs/contributing-book/src/code)	33s
forc-inline-tests	1m 10s
build-examples	2m 15s
	7m 43s

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