Add notice that fs mapping does not apply to relative paths. (#2912) #13191

Job	Run time
check_if_release_branch	1s
changed_files	11s
towncrier_check	12s
build mirrord CLI	0s
test_agent_image	6m 49s
check-rust-docs	4m 45s
lint	13m 3s
integration_tests	14m 22s
macos_tests	46m 32s
test_agent	3m 17s
test_cli_image	16m 49s
lint_markdown	0s
e2e (docker)	11m 45s
e2e (containerd)	10m 43s
vscode_e2e_on_release_branch	0s
intellij_e2e_on_release_branch	0s
ci	1s
	2h 8m 30s

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