Fix API links in FAQ page (#2077)

The links to the API page on the current FAQ page go to
https://google.github.io/osv.dev/faq/api/, which is 404. This change
fixes that behavior by going up a folder.

Tested: built and verified change by following
https://github.com/google/osv.dev/blob/master/CONTRIBUTING.md#contributing-documentation

docs/faq.md

@@ -36,7 +36,7 @@ See our blog posts for more details:
 
 The OSV schema and OSV.dev can be used by both:
 
-1. Open source consumers: By querying [OSV.dev's API](./api/) and using our tooling to find known vulnerabilities in their dependencies.
+1. Open source consumers: By querying [OSV.dev's API](../api/) and using our tooling to find known vulnerabilities in their dependencies.
 2. Vulnerability database producers: By making the database available in the OSV format.
 
 ## Why a new format to describe vulnerability?
@@ -66,7 +66,7 @@ present (but empty) in the [data exports](#is-the-database-available-to-download
 
 ## How do I use OSV as an open source user?
 
-OSV.dev provides an [easy-to-use API](./api/) for querying against the aggregated database of vulnerabilities.
+OSV.dev provides an [easy-to-use API](../api/) for querying against the aggregated database of vulnerabilities.
 
 [Command line tooling](https://github.com/google/osv-scanner) is also available for vulnerability scanning of SBOMs, language manifests, and container images.
 
@@ -130,4 +130,4 @@ For sources that are a Git repository, the `Import Source` field points to the
 authoritative source of the data, and you may be able to create a pull/merge
 request or file an issue against the repository.
 
-If you are not able to get satisfaction after dealing directly with the source of the data, please [file an issue](https://github.com/google/osv.dev/issues?q=is%3Aissue+is%3Aopen+label%3A%22data+quality%22) tagged with `data quality`.
+If you are not able to get satisfaction after dealing directly with the source of the data, please [file an issue](https://github.com/google/osv.dev/issues?q=is%3Aissue+is%3Aopen+label%3A%22data+quality%22) tagged with `data quality`.