docs: Minor change to wording of junction speeds

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

docs/Kinematics.md

@@ -87,9 +87,9 @@ small junction speed is permitted.
 The junction speeds are determined using "approximated centripetal
 acceleration". Best
 [described by the author](https://onehossshay.wordpress.com/2011/09/24/improving_grbl_cornering_algorithm/).
-However, in Klipper, cornering velocities are configured by specifying
-the desired speed that a 90° corner should have (the "square corner
-velocity"), and the cornering speeds for other angles are derived from
+However, in Klipper, junction speeds are configured by specifying the
+desired speed that a 90° corner should have (the "square corner
+velocity"), and the junction speeds for other angles are derived from
 that.
 
 Klipper implements look-ahead between moves that have similar extruder