[DOCS] Force merge doesn't mark index as read-only (#98357) (#98366)

(cherry picked from commit d4c6208727fe0b76906006fd699e7ac5bf9474f6)

Co-authored-by: Gilad Gal <gilad.gal@elastic.co>

docs/reference/ilm/ilm-actions.asciidoc

@@ -11,7 +11,6 @@ Permanently remove the index.
 
 <<ilm-forcemerge,Force merge>>::
 Reduce the number of index segments and purge deleted documents.
-Makes the index read-only.
 
 <<ilm-migrate,Migrate>>::
 Move the index shards to the <<data-tiers, data tier>> that corresponds