nvda

caeb1923 - User guide and what's new for 2017.3: spelling fixes, grammar changes, making user guide friendlier, edits to what's new. (PR #7373, issue #7371)

User guide and what's new for 2017.3: spelling fixes, grammar changes, making user guide friendlier, edits to what's new. (PR #7373, issue #7371) * User guide: spelling fixes, make use of American English spellings. re #7371. Changes include: * Added 'Welcome to NVDA!' at the beginning of the user guide to make it even friendlier. * Realising: realizing. * Licence: license. * Organised: organized. * Combobox: combo box. * Capitalized features list and language names. * User guide: appModules > settings and add-ons to make it friendlier. re #7371. * User guide: tels -> tells, self-voicing > sleep mode. re #7371. * What's new: entry fixes, mostly linguistic fixes and capitalization.