Migrate VTT section to Chapters guide #962

Job	Run time
get_available_profiles	1m 53s
update_client_pr	0s
close_client_pr	0s
merge_client_pr (android-uploader, api.video-android-uploader)	5s
merge_client_pr (android, api.video-android-client)	4s
merge_client_pr (csharp, api.video-csharp-client)	1m 11s
merge_client_pr (documentation, api.video-documentation)	5s
merge_client_pr (go, api.video-go-client)	2s
merge_client_pr (java, api.video-java-client)	2s
merge_client_pr (nodejs, api.video-nodejs-client)	11s
merge_client_pr (php, api.video-php-client)	2s
merge_client_pr (python, api.video-python-client)	5s
merge_client_pr (swift5-uploader, api.video-ios-uploader)	6s
merge_client_pr (swift5, api.video-ios-client)	4s
	3m 50s

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