Fix duplicate H1 headers #1226

Job	Run time
get_available_profiles	8s
get_available_profiles	8s
merge_client_pr	0s
merge_client_pr	0s
update_client_pr (android-uploader, api.video-android-uploader)	36s
update_client_pr (android-uploader, api.video-android-uploader)	36s
close_client_pr	0s
close_client_pr	0s
update_client_pr (android, api.video-android-client)	1m 2s
update_client_pr (android, api.video-android-client)	1m 2s
update_client_pr (csharp, api.video-csharp-client)	25s
update_client_pr (csharp, api.video-csharp-client)	25s
update_client_pr (go, api.video-go-client)	29s
update_client_pr (go, api.video-go-client)	29s
update_client_pr (java, api.video-java-client)	1m 8s
update_client_pr (java, api.video-java-client)	1m 8s
update_client_pr (nodejs, api.video-nodejs-client)	1m 59s
update_client_pr (nodejs, api.video-nodejs-client)	1m 59s
update_client_pr (php, api.video-php-client)	32s
update_client_pr (php, api.video-php-client)	32s
update_client_pr (python, api.video-python-client)	26s
update_client_pr (python, api.video-python-client)	26s
update_client_pr (swift5-uploader, api.video-ios-uploader)	34s
update_client_pr (swift5-uploader, api.video-ios-uploader)	34s
update_client_pr (swift5, api.video-ios-client)	22s
update_client_pr (swift5, api.video-ios-client)	22s
generate_documentation	16s
generate_documentation	27s
	16m 5s

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