Update index.md

The document said that Hubspot (cassic) was being discontinued, but it wasn't clear that this document is Hubspot classic.  I've added Classic to the title.

Author: popebear

src/connections/destinations/catalog/hubspot/index.md

@@ -1,6 +1,6 @@
 ---
 rewrite: true
-title: HubSpot Destination
+title: HubSpot (Classic) Destination
 hide-personas-partial: true
 cmode-override: true
 id: 54521fd725e721e32a72eec1