Merge pull request #2366 from dolthub/zachmu/faq-update

Added a FAQ on garbage and local storage size

packages/dolt/content/other/faq.md

@@ -87,6 +87,14 @@ us know with an issue](https://github.com/dolthub/dolt/issues) or in
 [our Discord](https://discord.gg/s8uVgc3) and we'll [fix it in 24 hours](https://www.dolthub.com/blog/2024-05-15-24-hour-bug-fixes/). 
 Our goal is to be a 100% drop-in replacement for MySQL.
 
+## Why is my Dolt database so big on disk?
+
+Dolt generates a lot of garbage during some writes, especially during initial import. It's not
+unusual to get a local storage size of 20x the actual data size after an import. Running `dolt gc`
+will remove the garbage and reclaim local storage. See the [docs on `dolt
+gc`](../reference/cli/cli.md#dolt-gc) and the [`dolt_gc` stored
+procedure](../reference/sql/version-control/dolt-sql-procedures.md#dolt_gc) for details.
+
 ## How do I squash the history of a Dolt database? I only want the latest.
 
 You can perform a shallow [clone](https://docs.dolthub.com/sql-reference/version-control/dolt-sql-procedures#dolt_clone) of a database by using the `--depth` flag. If you only want