doc: update/cleanup extras.md

doc/md/packages/extras.md

@@ -1,7 +1,7 @@
 
 ### Extras
 
-For convenience, some software that are not part of the official Debian distribution is included in the live system/installer. These components are listed in [Makefile.extra](https://gitlab.com/nodiscc/debian-live-config/-/blob/master/Makefile.extra):
+Components that are not part of the official Debian distribution are listed in [Makefile.extra](https://gitlab.com/nodiscc/debian-live-config/-/blob/master/Makefile.extra):
 
 <!-- grep '# EXTRA' Makefile.extra -->
 
@@ -12,4 +12,4 @@ For convenience, some software that are not part of the official Debian distribu
  - https://addons.mozilla.org/en-US/firefox/addon/keepassxc-browser/
  - https://addons.mozilla.org/en-US/firefox/addon/cookie-autodelete/
 
-These components installed from a [third-party APT repository](http://nodiscc.gitlab.io/toolbox), you will not receive any updates for this packages unless you [enable the APT repository manually](https://gitlab.com/nodiscc/debian-live-config/-/blob/bullseye/config/includes.chroot/etc/apt/sources.list.d/debian-live-config.list= or) someone [packages and uploads newer versions](https://wnpp.debian.net/) to official Debian repositories.
+These components are downloaded from a [third-party repository](http://nodiscc.gitlab.io/toolbox), you will not receive any updates for these packages unless you [enable the APT repository manually](https://gitlab.com/nodiscc/debian-live-config/-/blob/bullseye/config/includes.chroot/etc/apt/sources.list.d/debian-live-config.list) or if an official package with the same name is someday [added to Debian repositories](https://wnpp.debian.net/).