diff --git a/doc/go1.21.html b/doc/go1.21.html
index 0698ac109e..5ecc07ddcf 100644
--- a/doc/go1.21.html
+++ b/doc/go1.21.html
@@ -74,13 +74,13 @@ Do not send CLs removing the interior tags from such phrases.
     </li>
     <li>Repeat until the list of packages is empty:
       <ul>
-	<li>
-	  Find the first package in the list for which all imports are
-	  already initialized.
-	</li>
-	<li>
-	  Initialize that package and remove it from the list.
-	</li>
+        <li>
+          Find the first package in the list for which all imports are
+          already initialized.
+        </li>
+        <li>
+          Initialize that package and remove it from the list.
+        </li>
       </ul>
     </li>
   </ul>
@@ -1128,13 +1128,13 @@ Do not send CLs removing the interior tags from such phrases.
       such that <code>errors.Is(err, errors.ErrUnsupported)</code>
       returns true.
       <ul>
-	<li><code>ENOSYS</code></li>
-	<li><code>ENOTSUP</code></li>
-	<li><code>EOPNOTSUPP</code></li>
-	<li><code>EPLAN9</code> (Plan 9 only)</li>
-	<li><code>ERROR_CALL_NOT_IMPLEMENTED</code> (Windows only)</li>
-	<li><code>ERROR_NOT_SUPPORTED</code> (Windows only)</li>
-	<li><code>EWINDOWS</code> (Windows only)</li>
+        <li><code>ENOSYS</code></li>
+        <li><code>ENOTSUP</code></li>
+        <li><code>EOPNOTSUPP</code></li>
+        <li><code>EPLAN9</code> (Plan 9 only)</li>
+        <li><code>ERROR_CALL_NOT_IMPLEMENTED</code> (Windows only)</li>
+        <li><code>ERROR_NOT_SUPPORTED</code> (Windows only)</li>
+        <li><code>EWINDOWS</code> (Windows only)</li>
       </ul>
     </p>
   </dd>