PageVariantInterface docs mention class that doesn't exist

I found the BlockPageVariant as an alternative to mention

Seems straight forward.

I read

</code> and confirmed that this is what it actually does. Since it's always good to check <em>why</em> something like this is wrong (especially to confirm that we have the correct replacement, I did:
<code>
git log -S "FullPageVariant"

It looks like this was removed back in 2014 in [#]. That issue includes e.g.:

diff --git a/core/lib/Drupal/Core/Display/Annotation/DisplayVariant.php b/core/lib/Drupal/Core/Display/Annotation/DisplayVariant.php
index 3c05cf3b85e..3bf74920f3c 100644
--- a/core/lib/Drupal/Core/Display/Annotation/DisplayVariant.php
+++ b/core/lib/Drupal/Core/Display/Annotation/DisplayVariant.php
@@ -25,8 +25,9 @@
  *
  * Plugin namespace: Plugin\DisplayVariant
  *
- * For a working example, see
- * \Drupal\block\Plugin\DisplayVariant\FullPageVariant
+ * For working examples, see
+ * - \Drupal\Core\Render\Plugin\DisplayVariant\SimplePageVariant
+ * - \Drupal\block\Plugin\DisplayVariant\BlockPageVariant
  *

...and git even detects it as a rewritten file:

 .../{FullPageVariant.php => BlockPageVariant.php}  |  12 +-

Finally, I grepped to confirm that there were no other stale references to FullPageVariant:

[ayrton:drupal | Fri 14:33:16] $ grep -r "FullPageVariant" *
core/lib/Drupal/Core/Display/PageVariantInterface.php: * For example, the \Drupal\block\Plugin\DisplayVariant\FullPageVariant page

Committed to 11.x, and cherry-picked to 11.2.x as a patch-safe documentation bug fix. Thanks!

xjm → closed merge request !12832

Automatically closed - issue fixed for 2 weeks with no activity.