feat: add general cross messages docs #3169

Job	Run time
contracts-prettier / prettier	27s
license / License checks	11s
build / Build IPC	17m 39s
contracts-sast / Solhint check	32s
contracts-sast / Slither check	1m 7s
contracts-sast / Aderyn check	5m 10s
contracts-deployment-test / build	1m 46s
contracts-storage / Storage layout check	1m 27s
contracts-test / tests	5m 48s
extras / Extras: Axelar token	40s
fevm-contract-tests	0s
e2e-tests / run	22m 57s
unit-tests / run	16m 37s
docker-publish	0s
	1h 14m 21s

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