docs: enhance dynamic-remotes example documentation and modernization guide #4937

Job	Run time
stop-previous-run	3s
save-env	3s
forked_master_status	49s
setup-matrix	3m 59s
run-e2e-test (advanced-apis)	2m 23s
run-e2e-test (module-federation-examples-root)	2m 55s
run-e2e-test (dynamic-remotes)	2m 30s
	12m 42s

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