Adds note to "Accessing StashDB" about expiring activation links

docs/faq_getting-started/stashdb/accessing-stashdb.md

@@ -37,8 +37,9 @@ New accounts start with READ access only. If you'd like to add or edit any data
     - Copy and paste this entire code into the registration form: <br> {% include invite-code.txt %} <br> It has a limited number of uses so it will be replaced periodically.
     - Invite codes will also be pinned to the [**#stashdb-invites** channel](https://discord.com/channels/559159668438728723/935614155107471442){:target="_blank"} on [Discord](https://discord.com/invite/2TsNFKt){:target="_blank"} and in the [**StashDB - Invites** room topic](https://matrix.to/#/#stashdb-invites:unredacted.org){:target="_blank"} on [Matrix](https://matrix.to/#/#stashapp:unredacted.org){:target="_blank"}.
     - If any of these codes have expired, please ask politely for it to be refreshed by pinging either **@AdultSun** on Discord or **@DogmaDragon** on Matrix in the appropriate channel/room. A few other elevated users can also generate invite codes if necessary.
-1. **Check for an email from StashDB and click the confirmation link**
-    - Please wait a few minutes for it to arrive. If you still don't see it, try refreshing your inbox or checking your spam/junk folder.
+1. **Check for an email from StashDB and click the activation link**
+    - Please wait a few minutes for the email to arrive. If you still don't see it, try refreshing your inbox or checking your spam/junk folder.
+    - Your activation link is only good for about 2 hours. You'll have to start over if it expires.
     - The link will direct you to a webpage to *choose your username and password for the first time*. This is not a generic login page even though it may look like one. This has confused others before, so just keep going.
 1. **Choose your username**
     - Do *not* enter your email address as your username here.