add settings to update docs

Author: Hendrik Muhs

docs/reference/transform/apis/update-transform.asciidoc

@@ -159,6 +159,23 @@ delays.
 ====
 //End sync
 
+//Begin settings
+`settings`::
+(Optional, object)
+include::{docdir}/rest-api/common-parms.asciidoc[tag=transform-settings]
++
+.Properties of `settings`
+[%collapsible%open]
+====
+`docs_per_second`:::
+(Optional, float)
+include::{docdir}/rest-api/common-parms.asciidoc[tag=transform-settings-docs-per-second]
+`max_page_search_size`:::
+(Optional, integer)
+include::{docdir}/rest-api/common-parms.asciidoc[tag=transform-settings-max-page-search-size]
+====
+//End settings
+
 [[update-transform-example]]
 ==== {api-examples-title}