Revert "doc: hide version filter"

This reverts commit dbecc20.

Author: edmont

docs/known_issues.rst

@@ -21,16 +21,15 @@ A known issue can list one or both of the following entries:
   Some known issues have a workaround.
   Sometimes, they are discovered later and added over time.
 
-..
-  .. version-filter::
-    :default: v1-2-1
-    :container: dl/dt
-    :tags: [("wontfix", "Won't fix")]
+.. version-filter::
+  :default: v1-2-1
+  :container: dl/dt
+  :tags: [("wontfix", "Won't fix")]
 
-  .. page-filter::
-    :name: issues
+.. page-filter::
+  :name: issues
 
-    wontfix    Won't fix
+  wontfix    Won't fix
 
 List of known issues
 ********************