Website: Update FAQ.md (#23718)

- 1000 => 300
- "cost-efficient" might make it seem like it's cost prohibitive for
everyone (but the real problem is just that we can't quite yet afford to
run thousands of small instances of Fleet for folks with 10-100 hosts,
because it means increasing infrastructure engineering headcount)

docs/Get started/FAQ.md

@@ -4,7 +4,7 @@
 
 Fleet offers managed cloud hosting for [Fleet Premium](https://fleetdm.com/pricing) customers with large deployments.
 
-> While organizations of all kinds use Fleet, from Fortune 500 companies to school districts to hobbyists, we are only currently able to provide cost-effective hosting for deployments larger than 1000 hosts.  (Instead, you can [buy a license](https://fleetdm.com/customers/register) and self-host Fleet Premium with support.)
+> While organizations of all kinds use Fleet, from Fortune 500 companies to school districts to hobbyists, today we are only currently able to provide fully-managed hosting for deployments larger than 300 hosts.  (Instead, you can [buy a license](https://fleetdm.com/customers/register) and self-host Fleet Premium with support.)
 
 Fleet is simple enough to [spin up for yourself](https://fleetdm.com/docs/deploy/introduction).  Premium features are [available](https://fleetdm.com/pricing) either way.