Change filename suffix from "me" to "md".

After changing input method to Chinese input, you can type letters to combine Chinese characters, and select characters needed into editors in focus.

You should say:
If you haven't logged into the Ubuntu Store yet

Instead of :
If you didn't logged into the Ubuntu Store yet

"anbox_desktop_armv7a_arm" is already renamed to "anbox_desktop_armv7a_neon".

Setting up the build environment is a required step.

Without it, the subsequent step `lunch` will not be available.
Signed-off-by: NLee Jones <lee.jones@linaro.org>