fix: renderer.look_at_view_transform args docs updated (#693)

Summary:
Caught a silly typo in the docs, figured I'd send in a PR. Thanks for sharing your work!

Pull Request resolved: https://github.com/facebookresearch/pytorch3d/pull/693

Reviewed By: bottler

Differential Revision: D28837851

Pulled By: patricklabatut

fbshipit-source-id: c326189007c3537429a8aa2a3b2850d60b74b16d

pytorch3d/renderer/cameras.py

@@ -1360,7 +1360,7 @@ def look_at_view_transform(
             the camera is projected onto a horizontal plane y = 0.
             azim is the angle between the projected vector and a
             reference vector at (0, 0, 1) on the reference plane (the horizontal plane).
-        dist, elem and azim can be of shape (1), (N).
+        dist, elev and azim can be of shape (1), (N).
         degrees: boolean flag to indicate if the elevation and azimuth
             angles are specified in degrees or radians.
         eye: the position of the camera(s) in world coordinates. If eye is not