[Kheartz]

Adds a Flying subsection to the Animal forms section of the Appearance guide, for the frequent question of how to make a winged form fly.

It covers:

• that a form gives a flier its poses but no flight, so a client script flies the local player;
• how the poses follow: every game watches the ground under a flier, takes off above 1.2 m, lands within 40 cm and faces the way it moves, so anything that lifts a flier (a script, a teleport, a launch) gets them;
• a server sample: a /fly command that checks canFly in Beast.catalog(), scales speed with the form's size and tells the client to take off or land;
• a client sample: stopPlayerInput and setCollision(false), steps steered by Camera.capture() and Key.isDown, a World.lineTrace to stop short of walls, and a landing at the takeoff height with resetFall();
• landing a flier before turning them back or when they die.

The existing "does not lift them there" line links to it, and the guide's description and overview entry mention flying.

docs:check passes locally: 226 samples in 56 guides against the 1.10.0 contract.