Replace Humanoids with Bipeds in docs.

PiperOrigin-RevId: 565474154
Change-Id: I6eb5d794a6a80f94c7c067191ea51fd62047d773

README.md

@@ -147,7 +147,7 @@ Menagerie, see [CONTRIBUTING](CONTRIBUTING.md).
 | [Shadow E3M5](shadow_hand/README.md)|[<img src="shadow_hand/shadow_hand.png" width="400">](shadow_hand/README.md)|A|
 | [Allegro V3](wonik_allegro/README.md)|[<img src="wonik_allegro/allegro_hand.png" width="400">](wonik_allegro/README.md)|C|
 | [Robotiq 2F-85](robotiq_2f85/README.md)|[<img src="robotiq_2f85/2f85.png" width="400">](robotiq_2f85/README.md)|B|
-| Humanoids         |               |         |
+| Bipeds             |               |         |
 | [Cassie](agility_cassie/README.md)|[<img src="agility_cassie/cassie.png" width="400">](agility_cassie/README.md)|C|
 | [Robotis OP3](robotis_op3/README.md)|[<img src="robotis_op3/op3.png" width="400">](robotis_op3/README.md)|A+|
 | Quadrupeds         |              |         |