Remove outdated versionadded/versionchanged annotations

docs/advanced_topics/documents/custom_document_model.rst

@@ -34,10 +34,6 @@ Here's an example:
             'source',
         )
 
-.. versionchanged:: 2.12
-
-    Fields on a custom document model can now be defined as required (``blank=False``).
-
 Then in your settings module:
 
 .. code-block:: python

docs/advanced_topics/i18n.rst

@@ -11,8 +11,6 @@ Internationalisation
 Multi-language content
 ======================
 
-.. versionadded:: 2.11
-
 Overview
 --------
 

docs/contributing/documentation_guidelines.md

@@ -224,11 +224,11 @@ Safari         Windows
 Sphinx offers release-metadata directives to generate this information consistently. Use as appropriate.
 
     ```eval_rst
-    .. versionadded:: 2.11
+    .. versionadded:: 2.15
     ```
 
     ```eval_rst
-    .. versionchanged:: 2.11
+    .. versionchanged:: 2.15
     ```
 
 <details>
@@ -236,11 +236,11 @@ Sphinx offers release-metadata directives to generate this information consisten
 <summary>Rendered output</summary>
 
 ```eval_rst
-.. versionadded:: 2.11
+.. versionadded:: 2.15
 ```
 
 ```eval_rst
-.. versionchanged:: 2.11
+.. versionchanged:: 2.15
 ```
 
 </details>

docs/reference/settings.rst

@@ -72,8 +72,6 @@ Set the number of days (default 7) that search query logs are kept for; these ar
 Internationalisation
 ====================
 
-.. versionadded:: 2.11
-
 Wagtail supports internationalisation of content by maintaining separate trees
 of pages for each language.
 

docs/reference/streamfield/blocks.rst

@@ -67,10 +67,6 @@ Field block types
    :param validators: A list of validation functions for the field (see `Django Validators <https://docs.djangoproject.com/en/stable/ref/validators/>`__).
    :param form_classname: A value to add to the form field's ``class`` attribute when rendered on the page editing form.
 
-   .. versionchanged:: 2.11
-
-       The ``class`` attribute was previously set via the keyword argument ``classname``.
-
 
 .. class:: wagtail.core.blocks.TextBlock
 

docs/topics/streamfield.rst

@@ -540,11 +540,6 @@ A StreamField's value behaves as a list, and blocks can be inserted, overwritten
     my_page.save()
 
 
-.. versionadded:: 2.12
-
-    In earlier versions, a StreamField value could be replaced by assigning a new list of *(block_type, value)* tuples, but not modified in-place.
-
-
 .. _streamfield_migrating_richtext:
 
 Migrating RichTextFields to StreamField