Update docs now that keyword dimensions support ignore_above (elastic…

…#110385)

This is a follow-up from elastic#110337

docs/reference/mapping/types/keyword.asciidoc

@@ -166,7 +166,6 @@ Dimension fields have the following constraints:
 * Field values cannot be an <<array,array or multi-value>>.
 // end::dimension[]
 * Dimension values are used to identify a document’s time series. If dimension values are altered in any way during indexing, the document will be stored as belonging to different from intended time series. As a result there are additional constraints:
-** <<ignore-above,`ignore_above`>> mapping parameter isn't supported.
 ** The field cannot use a <<normalizer,`normalizer`>>.
 --