[Doc] Remove mention of generated fields in get/mget docs (#25492)

This option has been removed in #20102.

Author: tlrx

docs/reference/docs/get.asciidoc

@@ -221,13 +221,6 @@ The result of the above get operation is:
 Also only leaf fields can be returned via the `stored_field` option. So object fields can't be returned and such requests
 will fail.
 
-[float]
-[[generated-fields]]
-=== Generated fields
-If no refresh occurred between indexing and refresh, GET will access the transaction log to fetch the document. However, some fields are generated only when indexing. 
-If you try to access a field that is only generated when indexing, you will get an exception (default). You can choose to ignore field that are generated if the transaction log is accessed by setting `ignore_errors_on_generated_fields=true`.
-
-
 [float]
 [[_source]]
 === Getting the _source directly

docs/reference/docs/multi-get.asciidoc

@@ -215,11 +215,6 @@ GET /test/type/_mget?stored_fields=field1,field2
 <1> Returns `field1` and `field2`
 <2> Returns `field3` and `field4`
 
-[float]
-=== Generated fields
-
-See <<generated-fields>> for fields generated only when indexing.
-
 [float]
 [[mget-routing]]
 === Routing