fix typos, Jeep tuning (#511)

README.md

@@ -126,7 +126,7 @@ In Progress Cars
   - Only remaining Toyota cars with no port yet are the Avalon and the Sienna.
 - All Hyundai with SmartSense.
 - All Kia with SCC and LKAS.
-- All Chrysler, Jeep, Fiat with Adaprive Cruise Control and LaneSense.
+- All Chrysler, Jeep, Fiat with Adaptive Cruise Control and LaneSense.
 
 How can I add support for my car?
 ------

selfdrive/car/chrysler/chryslercan.py

@@ -55,7 +55,7 @@ def create_lkas_hud(gear, lkas_active, hud_alert, car_fingerprint):
   # LKAS_HUD (678) Controls what lane-keeping icon is displayed.
 
   if hud_alert == VisualAlert.steerRequired:
-    msg = msg = '0000000300000000'.decode('hex')
+    msg = '0000000300000000'.decode('hex')
     return make_can_msg(0x2a6, msg)
 
   # TODO: use can packer

selfdrive/car/chrysler/interface.py

@@ -81,6 +81,8 @@ class CarInterface(object):
 
     if candidate == CAR.JEEP_CHEROKEE:
       ret.wheelbase = 2.91  # in meters
+      ret.steerRatio = 12.7
+      ret.steerActuatorDelay = 0.2  # in seconds
 
     ret.centerToFront = ret.wheelbase * 0.44