Use consistent typography

wiki/src/news/version_4.18.mdwn

@@ -20,7 +20,7 @@ You should upgrade as soon as possible.
 
   We now use Weblate to provide translated text for Tails and the Tails website,
   so Poedit isn't as necessary. To install Poedit in Tails, see our guide on
-  *[[Additional Software|doc/first_steps/additional_software]]* ([[!tails_ticket 18236]])
+  [[Additional Software|doc/first_steps/additional_software]] ([[!tails_ticket 18236]])
 
 - Update *Tor Browser* to [10.0.16](https://blog.torproject.org/new-release-tor-browser-10016).
 
@@ -34,7 +34,7 @@ hardware (graphics, Wi-Fi, and so on).
 - Use more reliable Debian repositories
 
   Tails now connects to the APT repositories of Debian using their HTTPS address instead of their .onion address, for increased reliability with
-  *[[Additional Software|doc/first_steps/additional_software]]* installation.
+  the [[Additional Software|doc/first_steps/additional_software]] feature.
   We left other Tails and Tor Project APT onion sources as is. ([[!tails_ticket 17993]])
 
 - Display an error message when the Upgrader fails to download the signing key.