Add `page` command as an imitation of arc's page.

https://github.com/appium/ruby_lib/blob/7c9e8d0ee33a2d067d4e8c5cb19abf456306851a/lib/appium_lib/ios/helper.rb#L111-L152
Reformat synopsis documentation
v0.07

 - Add `page` command like arc's
 - Add precise tap subroutine that maps does 'mobile: tap'