Update terms-aggregation.asciidoc

It looks like the reference editor forgot to remove some draft notes. These two sentences look more like a release notes than the reference info.

Closes #8469

Author: Sergii Golubev

docs/reference/search/aggregations/bucket/terms-aggregation.asciidoc

@@ -616,10 +616,6 @@ this would typically be too costly in terms of RAM.
 [[search-aggregations-bucket-terms-aggregation-execution-hint]]
 ==== Execution hint
 
-Added the `global_ordinals`, `global_ordinals_hash` and `global_ordinals_low_cardinality` execution modes
-
-Removed the `ordinals` execution mode
-
 There are different mechanisms by which terms aggregations can be executed:
 
  - by using field values directly in order to aggregate data per-bucket (`map`)