Update docs/modules/ROOT/pages/upgrade_to_version_2.adoc

Co-authored-by: Benjamin Quorning <[email protected]>

Author: pirj

docs/modules/ROOT/pages/upgrade_to_version_2.adoc

@@ -160,6 +160,6 @@ https://github.com/rubocop-hq/rubocop-rspec/pull/956[Pull request with more exam
 
 === Conform with RuboCop API Changes
 
-The parent project, RuboCop, have API changes.
+The parent project, RuboCop, has API changes.
 They won't result in cop breakages, however, it's recommended to update cops to use new APIs.
 Follow the https://docs.rubocop.org/rubocop/v1_upgrade_notes[RuboCop's core v1 update guide] to adjust custom cops' RuboCop Autocorrect API usage.