the is_founder view function is only useful if the user already did t… (0LNetworkCommunity#144)

* the is_founder view function is only useful if the user already did the migration to v8.

* activity::is_pre_v8 is the correct one

Author: codilion

docs/guides/founder/migrate-to-v8.md

@@ -30,9 +30,9 @@ libra --version   # Must show version ≥ 8.0
 
 If not installed, follow → Install the Open Libra CLI from [source code](https://docs.openlibra.io/getting-started/install-open-libra-cli) or [binaries](https://docs.openlibra.io/getting-started/install-open-libra-cli/install-open-libra-cli-binaries)
 
-### Verify You're a Founder
+### Verify if account is a Pre-v8 address 
 ```bash
-libra query view -f 0x1::founder::is_founder --args <your-address>
+libra query view -f 0x1::activity::is_pre_v8 --args <your-address>
 ```
 If this returns **true**, continue with this guide.