update docs (#1866)

mmdet3d/structures/bbox_3d/box_3d_mode.py

@@ -41,7 +41,7 @@ class Box3DMode(IntEnum):
              v
         down y
 
-    The relative coordinate of bottom center in a CAM box is [0.5, 1.0, 0.5],
+    The relative coordinate of bottom center in a CAM box is (0.5, 1.0, 0.5),
     and the yaw is around the y axis, thus the rotation axis=1.
 
     Coordinates in Depth mode:

mmdet3d/structures/bbox_3d/coord_3d_mode.py

@@ -41,7 +41,7 @@ class Coord3DMode(IntEnum):
              v
         down y
 
-    The relative coordinate of bottom center in a CAM box is [0.5, 1.0, 0.5],
+    The relative coordinate of bottom center in a CAM box is (0.5, 1.0, 0.5),
     and the yaw is around the y axis, thus the rotation axis=1.
 
     Coordinates in Depth mode:

mmdet3d/structures/bbox_3d/depth_box3d.py

@@ -14,7 +14,7 @@ class DepthInstance3DBoxes(BaseInstance3DBoxes):
 
     .. code-block:: none
 
-                    up z    y front (yaw=-0.5*pi)
+                    up z    y front (yaw=0.5*pi)
                        ^   ^
                        |  /
                        | /