add mention of 5.22 when backup fil was allowed (#1775)

Author: AlexicaWright

modules/ROOT/pages/tools/neo4j-admin/upload-to-aura.adoc

@@ -5,6 +5,7 @@
 = Upload to Neo4j Aura
 
 The `neo4j-admin database upload` command uploads a local Neo4j database dump or backup file into a Neo4j Aura instance.
+The option of using a `.backup` file with the `neo4j-admin database upload` command was introduced in 5.22.
 The following table shows the compatibility between the dump/backup version that you want to upload and the version of the Neo4j Aura instance.
 
 [options="header" cols="50%, 50%"]