Update data file availability point in the FAQ

I'm not yet convinced we have all the files - I've since realised the
"complete" 550 cache floating around is probably modified and includes
some files from a later revision.

Signed-off-by: Graham <gpe@openrs2.dev>

share/doc/faq.md

@@ -9,7 +9,7 @@ A mixture of reasons:
   considered 530, but 550 has a better built-in world map viewer (it supports
   dungeons in addition to the main surface).
 * Availability of the original loader, client, game unpacker and jaggl jars.
-* Availability of the complete set of original client data files.
+* Availability of a large proportion of the original client data files.
 * Availability of a large proportion of the location file encryption keys.
 
 ## Why do the OpenRS2 Natives use Maven instead of Gradle?