docs: Correct typo "firtly"->"first" in JSDoc comment

PiperOrigin-RevId: 794296046

Author: vertex-sdk-bot

src/types/content.ts

@@ -32,7 +32,7 @@ export declare interface VertexInit {
   project?: string;
   /**
    * Optional. The Google Cloud project location. If not provided, SDK will
-   * firtly try to resolve it from runtime environment. If no location resolved
+   * first try to resolve it from runtime environment. If no location resolved
    * from runtime environment, SDK will use default value `us-central1`.
    */
   location?: string;