Reference the correct location in the GQL reference

doc/api/vulnerabilities.md

@@ -18,7 +18,7 @@ WARNING:
 This API is in the process of being deprecated and considered unstable.
 The response payload may be subject to change or breakage
 across GitLab releases. Please use the
-[GraphQL API](graphql/reference/index.md#vulnerabilities)
+[GraphQL API](graphql/reference/index.md#queryvulnerabilities)
 instead.
 
 Every API call to vulnerabilities must be [authenticated](README.md#authentication).