AP_Motors: Change to description(NFC)

[muramura]

I change the description of the installation value to text.

I use it converted to Japanese.
This explanation did not become Japanese.

[rmackay9]

OK thanks. I think there are many parameter descriptions where we squish the words all together (i.e. we don't use spaces). I think if adding spaces makes the translation work then we should use spaces.

I've added this to tomorrow's dev call so we can decide if we will always use spaces from now on.

[rmackay9]

Merged, thanks!