RHIDP-8635-1 - [testday] Fix typo in localisation docs

Author: Gerry-Forde

modules/customizing-the-appearance/con-language-persistence.adoc

@@ -23,5 +23,5 @@ userSettings:
 where:
 
 userSettings:persistence:: 
-Enter `browser` to opt-out and use browser local storage. Optionally, set this value to `database` to persist across browsers and devices. This the default setting and does not require this configuration to be set.
+Enter `browser` to opt-out and use browser local storage. Optionally, set this value to `database` to persist across browsers and devices. This is the default setting and does not require this configuration to be set.