[DOCS] Remove ignore_z_value parameter link
Removes invalid ignore_z_value parameter link in geo-point.asciidoc.
@@ -105,7 +105,7 @@ The following parameters are accepted by `geo_point` fields:
If `true`, malformed geo-points are ignored. If `false` (default),
malformed geo-points throw an exception and reject the whole document.
-<<ignore_z_value,`ignore_z_value`>>::
+`ignore_z_value`::
If `true` (default) three dimension points will be accepted (stored in source)
but only latitude and longitude values will be indexed; the third dimension is
