Add missing keys referencing Delphi 10.2, 10.3 & 10.4.

Author: delphidabbler

Docs/Design/FileFormats/main-db.html

@@ -196,6 +196,9 @@ <h4>
 DelphiXE8=&lt;Y|N|Q|W&gt;
 Delphi10S=&lt;Y|N|Q|W&gt;
 Delphi101B=&lt;Y|N|Q|W&gt;
+Delphi102T=&lt;Y|N|Q|W&gt;
+Delphi103R=&lt;Y|N|Q|W&gt;
+Delphi104S=&lt;Y|N|Q|W&gt;
 FPC=&lt;Y|N|Q|W&gt;
 Extra=&lt;extra-info-REML&gt;
 StandardFormat=&lt;0|1&gt;