Fix seed command link (#4904)

## What are you changing in this pull request and why?
I found that this link was broken because it was referencing the same
page, but it should be linking to the reference page.

## Checklist
- [x] Review the [Content style
guide](https://github.com/dbt-labs/docs.getdbt.com/blob/current/contributing/content-style-guide.md)
so my content adheres to these guidelines.
- [x] For [docs
versioning](https://github.com/dbt-labs/docs.getdbt.com/blob/current/contributing/single-sourcing-content.md#about-versioning),
review how to [version a whole
page](https://github.com/dbt-labs/docs.getdbt.com/blob/current/contributing/single-sourcing-content.md#adding-a-new-version)
and [version a block of
content](https://github.com/dbt-labs/docs.getdbt.com/blob/current/contributing/single-sourcing-content.md#versioning-blocks-of-content).
- [x] Add a checklist item for anything that needs to happen before this
PR is merged, such as "needs technical review" or "change base branch."

website/docs/docs/build/seeds.md

@@ -7,7 +7,7 @@ id: "seeds"
 ## Related reference docs
 * [Seed configurations](/reference/seed-configs)
 * [Seed properties](/reference/seed-properties)
-* [`seed` command](/docs/build/seeds)
+* [`seed` command](/reference/commands/seed)
 
 ## Overview
 Seeds are CSV files in your dbt project (typically in your `seeds` directory), that dbt can load into your <Term id="data-warehouse" /> using the `dbt seed` command.