Update recommended kernel version.

Also remove explicit "-j"; the default is now to pick a sensible value
for the local system.

Test: N/A
Change-Id: Ic3176c21c0760441a59b4c98d0a740efcca7b296
diff --git a/docs/getting_started/yukawa.md b/docs/getting_started/yukawa.md
index 11f6b73..8ff569a 100644
--- a/docs/getting_started/yukawa.md
+++ b/docs/getting_started/yukawa.md
@@ -23,8 +23,8 @@
 $ . build/envsetup.sh
 $ lunch yukawa-userdebug
 $ export TARGET_VIM3L=true
-$ export TARGET_KERNEL_USE=5.4
-$ m -j$(nproc)
+$ export TARGET_KERNEL_USE=5.10
+$ m
 ```
 
 Flash your device and reboot.