typos in the manual

[Дилян Палаузов]

Hello,

please update the manual 2.0.2/25th April 2017 as follows:

"Appendix C: Where GRUB will go" states "We are currently working 
towards a 2.0 release".  This contradicts to "Appendix A How to obtain 
and build GRUB", where the current version is fixed to 2.0.2.

Section "16.3.21 linux" describes "devicetree", so the section shall be 
called "devicetree"

Section 16.3.16 config file: reword to:
  Any environment variable changes made by te commands in the file 
using SET will not be preserved after configure returns.  To preserve 
the variables changes use EXPORT.

Section 4.1 Installig GRUB using grub-install:  "The argument has to be 
either a device file."  There is an "OR" missing.

Section 3 OS-specific notes about grub tools; "When compiled with cygwin 
support then cygwin drive names are automatically when needed".  What 
are drive names automatically?

Regards
  Дилян