Fix cone joint setLimit action description

Author: jmiskovic

api/lovr/physics/ConeJoint/setLimit.lua

@@ -1,7 +1,7 @@
 return {
   summary = 'Set the angle limit of the ConeJoint.',
   description = [[
-    Returns the angle limit of the ConeJoint.  The relative angle between the ConeJoint's axis and
+    Sets the angle limit of the ConeJoint.  The relative angle between the ConeJoint's axis and
     the second Collider will be constrained to this limit.
   ]],
   arguments = {