typo in joint limits

Author: petercorke

roboticstoolbox/models/DH/AL5D.py

@@ -76,7 +76,7 @@ def __init__(self, symbolic=False):
         joint_limits = [
                 [-pi/2, pi/2],
                 [-pi/2, pi/2],
-                [-pi,2, pi/2],
+                [-pi/2, pi/2],
                 [-pi/2, pi/2],
             ]