tweak comments in android build files

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

configs/android2_defconfig

@@ -1,3 +1,5 @@
+# Run "make android2_defconfig", then "make".
+#
 # Tested with the standalone toolchain from ndk r6:
 # android-ndk-r6/build/tools/make-standalone-toolchain.sh --platform=android-8
 #

examples/android-build

@@ -2,9 +2,10 @@
 # Build Busybox against Android's bionic
 # Originally by Dan Fandrich
 #
-# Configure with android_defconfig
+# Configure with "make android_defconfig"
+#
 # This file has been tested on Android Froyo (the lack of ttyname_r in
-# the must be patched around) and Gingerbread.
+# the android libc must be patched around) and Gingerbread.
 
 # Point this to the Android root directory; it's used in the defconfig CFLAGS
 export A="$HOME/android"