add missing backticks to snippets in conf docs #14115

Job	Run time
changed_files	5s
check_if_release_branch	1s
towncrier_check	7s
build mirrord CLI	0s
check-rust-docs	1m 0s
integration_tests	5m 54s
lint_markdown	0s
lint	3m 24s
macos_tests	10m 29s
test_agent	3m 22s
test_agent_image	22s
test_cli_image	6m 9s
vscode_e2e_on_release_branch	0s
e2e (docker)	11m 35s
intellij_e2e_on_release_branch	0s
e2e (containerd)	9m 54s
ci	1s
	52m 23s

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