tp_account_channel_request_set_hints: document that set_hint is better for g-i
tp_account_channel_request_set_hints: document that set_hint is better for g-i

Signed-off-by: Simon McVittie <2b470b34502dbf3ba4bcc04ea7e64f4e0e104f33@collabora.co.uk>
Bug: https://bugs.freedesktop.org/show_bug.cgi?id=55099

Distrotech/telepathy-glib,Distrotech/telepathy-glib,Distrotech/telepathy-glib,Distrotech/telepathy-glib,Distrotech/telepathy-glib