docs: fix fal doc accuracy — array shape, auto-default, clamping, invalid JSON

- has_nsfw_concepts is an array (one per image), not a scalar
- Document pollsBeforeCompleted auto-default behavior
- Document clamping when pollsBeforeCompleted < pollsBeforeInProgress
- Add invalid JSON error row to Queue Lifecycle table

Author: jpr5

docs/fal-ai/index.html

@@ -139,7 +139,7 @@ <h2>Typed Helpers: <code>onFalImage</code> / <code>onFalVideo</code></h2>
         <p>
           Defaults filled in for image: <code>width: 1024</code>, <code>height: 1024</code>,
           <code>content_type</code> inferred from URL extension,
-          <code>has_nsfw_concepts: false</code>, <code>timings.inference: 0</code>,
+          <code>has_nsfw_concepts: [false, &hellip;]</code> (one per image), <code>timings.inference: 0</code>,
           <code>seed: 0</code>. For video: <code>content_type</code> +
           <code>file_name</code> inferred from URL, <code>file_size: 0</code>, <code>seed: 0</code>.
         </p>
@@ -223,6 +223,16 @@ <h2>Queue Lifecycle</h2>
                 <code>{ status: "ALREADY_COMPLETED" }</code> (400) after
               </td>
             </tr>
+            <tr>
+              <td>Submit (bad body)</td>
+              <td>POST</td>
+              <td><code>/fal/{owner}/{model}</code></td>
+              <td>
+                400 with
+                <code>{ error: { code: "invalid_json", type: "invalid_request_error", message } }</code>
+                when the request body is not valid JSON
+              </td>
+            </tr>
           </tbody>
         </table>
 
@@ -250,6 +260,21 @@ <h2>Polling Realism</h2>
 <span class="cm">// result  → 200 with the matched payload</span></code></pre>
         </div>
 
+        <div class="info-box">
+          <p>
+            When only <code>pollsBeforeInProgress</code> is set,
+            <code>pollsBeforeCompleted</code> defaults to
+            <code>pollsBeforeInProgress + 1</code> so the job always spends at least one poll
+            in <code>IN_PROGRESS</code>. Set both explicitly for full control.
+          </p>
+        </div>
+
+        <p>
+          If <code>pollsBeforeCompleted</code> is set lower than
+          <code>pollsBeforeInProgress</code>, it is clamped up so
+          <code>IN_PROGRESS</code> is never skipped.
+        </p>
+
         <p>
           <code>logs</code> always contains at least one entry (job enqueued); a transition entry is
           appended for each state change. Cancelling a job before completion sets status to