📝 Add docstrings to feat/postgres/support-vector

Docstrings generation was requested by @naorpeled.

* https://github.com/typeorm/typeorm/pull/11437#issuecomment-2888582935

The following files were modified:

* `test/functional/columns/vector/vector-similarity.ts`

test/functional/columns/vector/vector-similarity.ts

@@ -22,6 +22,13 @@ describe("columns > vector type > similarity operations", () => {
     beforeEach(() => reloadTestingDatabases(connections))
     after(() => closeTestingConnections(connections))
 
+    /**
+     * Inserts five test posts with predefined 3-dimensional vector embeddings into the database.
+     *
+     * Clears existing `Post` records and saves new posts with specific embeddings for use in similarity tests.
+     *
+     * @returns The array of saved `Post` entities with their assigned embeddings.
+     */
     async function setupTestData(connection: DataSource) {
         const postRepository = connection.getRepository(Post)
         await postRepository.clear() // Clear existing data