[Docs] Remove outdated info about enabling/disabling doc_values
@@ -44,8 +44,3 @@ PUT my_index
<1> The `status_code` field has `doc_values` enabled by default.
<2> The `session_id` has `doc_values` disabled, but can still be queried.
-TIP: The `doc_values` setting is allowed to have different settings for fields
-of the same name in the same index. It can be disabled (set to `false`) on
-existing fields using the <<indices-put-mapping,PUT mapping API>>.
-
-
