update doc reference to link to the docs jinja function instead of al…

…l jinja functions (#5663)

## What are you changing in this pull request and why?
the related docs for the docs jinja function links to all jinja
functions instead of straight to docs
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website/docs/docs/build/documentation.md

@@ -11,7 +11,7 @@ dbt provides a way to generate documentation for your dbt project and render it
 
 * [Declaring properties](/reference/configs-and-properties)
 * [`dbt docs` command](/reference/commands/cmd-docs)
-* [`doc` Jinja function](/reference/dbt-jinja-functions)
+* [`doc` Jinja function](/reference/dbt-jinja-functions/doc)
 * If you're new to dbt, we recommend that you check out our [quickstart guide](/guides) to build your first dbt project, complete with documentation.
 
 ## Assumed knowledge