doc: fix some warnings
doc: fix some warnings

Change-Id: I9667ef6c2c3b12de92dfd8f1a5e5900fe7220242

aldebaran/qibuild,dmerejkowsky/qibuild,dmerejkowsky/qibuild,dmerejkowsky/qibuild,dmerejkowsky/qibuild,aldebaran/qibuild,dmerejkowsky/qibuild,aldebaran/qibuild,aldebaran/qibuild