Fix links and some spelling in userguide (PR #10130)
fixes #9508
fixes #8314
* Replaced http with https in links
* Solved some spelling issues
* Removed "supported only by eSpeak" for inflection and change in pitch since this is also supported by other synthesizers.
Co-Authored-By: Reef Turner <feerrenrut@users.noreply.github.com>
