buck install -d is Android only
buck install -d is Android only

Summary:
- The `--device` aka `-d` option to `buck install` works only with Android devices.
- It does not work with iOS devices.
- Clarify this in the ref pge for `buck install`.

Reviewed By: styurin

fbshipit-source-id: 48ff444519

Addepar/buck,kageiit/buck,JoelMarcey/buck,zpao/buck,Addepar/buck,facebook/buck,facebook/buck,nguyentruongtho/buck,Addepar/buck,JoelMarcey/buck,kageiit/buck,Addepar/buck,nguyentruongtho/buck,JoelMarcey/buck,nguyentruongtho/buck,kageiit/buck,kageiit/buck,Addepar/buck,zpao/buck,zpao/buck,zpao/buck,JoelMarcey/buck,Addepar/buck,kageiit/buck,facebook/buck,JoelMarcey/buck,kageiit/buck,zpao/buck,zpao/buck,facebook/buck,Addepar/buck,nguyentruongtho/buck,Addepar/buck,JoelMarcey/buck,JoelMarcey/buck,kageiit/buck,facebook/buck,zpao/buck,Addepar/buck,Addepar/buck,nguyentruongtho/buck,Addepar/buck,Addepar/buck,nguyentruongtho/buck,facebook/buck,JoelMarcey/buck,JoelMarcey/buck,nguyentruongtho/buck,JoelMarcey/buck,JoelMarcey/buck,JoelMarcey/buck,JoelMarcey/buck,facebook/buck,Addepar/buck