Add DoH abbreviation to preference title so it's searchable

app/src/main/res/values/strings.xml

@@ -452,7 +452,7 @@
       <!-- Advanced section -->
     <string name="label_network">Network</string>
     <string name="pref_clear_cookies">Clear cookies</string>
-    <string name="pref_dns_over_https">DNS over HTTPS</string>
+    <string name="pref_dns_over_https">DNS over HTTPS (DoH)</string>
     <string name="requires_app_restart">Requires app restart to take effect</string>
     <string name="cookies_cleared">Cookies cleared</string>
     <string name="label_data">Data</string>