Fix broken custom data directories link
## Issue Addressed
No issue - its a broken link in the docs.
## Proposed Changes
Fix the broken link.
## Additional Info
N/A in this instance.
[launchpad]: https://launchpad.ethereum.org/
[lh-book]: https://lighthouse-book.sigmaprime.io/
[testnet-validator]: ./testnet-validator.md
-[custom-datadir]: ./custom-datadir.md
+[advanced-datadir]: ./advanced-datadir.md
[license]: https://github.com/sigp/lighthouse/blob/master/LICENSE
[slashing]: ./slashing-protection.md
[discord]: https://discord.gg/cyAszAh
@@ -146,7 +146,7 @@ lighthouse --network mainnet vc
```
> Note: `~/.lighthouse/mainnet` is the default directory which contains the keys and databases.
-> To specify a custom dir, see [Custom Directories][custom-datadir].
+> To specify a custom dir, see [Custom Directories][advanced-datadir].
#### Docker users
