After one too many pipeline failures due to old spell-checking
mistakes, I decided to own up to my stuff and spell check
everything. I actually ran:

     codespell --interactive 3 --write-changes *

And dealt with *almost* all the errors, except stuff in old/ which
I'll remove shortly.

When an error comes up now, it is new and should be fixed.

howto/conference.md

@@ -516,7 +516,7 @@ Each solution assumes it requires a dedicated server or virtual server
 to be setup, included in the "initial setup". Virtual servers require
 less work than physical servers to setup.
 
-The actualy prices quoted from Hetzner but virtual servers would
+The actual prices are quoted from Hetzner but virtual servers would
 probably be hosted in our infrastructure which might or might not
 incur additional costs.
 
@@ -681,7 +681,7 @@ systemli is using this ansible role to install coturn: https://github.com/system
 #### features
 
  * audio, video conferencing support
- * [accesssible](http://docs.bigbluebutton.org/support/faq.html#accessibility) with live closed captionning and support for screen readers
+ * [accessible](http://docs.bigbluebutton.org/support/faq.html#accessibility) with live closed captionning and support for screen readers
  * whiteboarding and "slideshow" mode (to show PDF presentations)
  * moderation tools
  * chat box
@@ -731,7 +731,7 @@ Media](https://tech.firstlook.media/how-to-pick-a-video-conferencing-platform) p
 
 ### Other alternatives
 
-Those alternatives have not been explicitely rejected but are somewhat
+Those alternatives have not been explicitly rejected but are somewhat
 out of scope, or have come up after the evaluation was performed:
 
  * [bbb-scale](https://gitlab.com/bbb-scale/bbb-scale) - scale Big