Spell out acronym on first use

I found knowing JWT stands for JSON Web Token made it slightly less mysterious and more modern. (I think there was some sort of JWT in Java.) It is also best practice to spell out acronyms on first use.

tinydrive/jwt-authentication.md

@@ -8,7 +8,7 @@ keywords: jwt authentication
 
 ## Introduction
 
-{{site.cloudfilemanager}} requires you to setup JWT authentication. This is to ensure that the security of your files remains in your control.
+{{site.cloudfilemanager}} requires you to setup JSON Web Token (JWT) authentication. This is to ensure that the security of your files remains in your control.
 
 JWT is a standard authorization solution for web services and is documented in more detail at the [https://jwt.io/](https://jwt.io/) website. The guide aims to show how to setup JWT authentication for {{site.cloudfilemanager}}.
 
@@ -179,4 +179,4 @@ If you managed to set this up, you should be good to go with checking out the va
 
 If you need some help, check our [help page]({{site.baseurl}}/tinydrive/get-help/) and if that doesn't work, [submit a support request]({{site.supporturl}}).
 
-{% include configuration/gen-rsa-key-pairs.md %}
+{% include configuration/gen-rsa-key-pairs.md %}