Extend http filter docs (#2990) #13586

Job	Run time
towncrier_check	11s
check_if_release_branch	1s
changed_files	6s
build mirrord CLI	0s
lint	3m 19s
check-rust-docs	4m 45s
macos_tests	23m 47s
integration_tests	13m 29s
test_agent	3m 15s
test_agent_image	6m 7s
test_cli_image	16m 33s
lint_markdown	0s
vscode_e2e_on_release_branch	0s
e2e (docker)	12m 53s
intellij_e2e_on_release_branch	0s
e2e (containerd)	12m 23s
ci	1s
	1h 36m 50s

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