Update ruby/ql/lib/change-notes/2022-04-30-update-grammar.md

Co-authored-by: intrigus-lgtm <60750685+intrigus-lgtm@users.noreply.github.com>

Author: aibaars

ruby/ql/lib/change-notes/2022-04-30-update-grammar.md

@@ -1,4 +1,4 @@
 ---
 category: fix
 ---
-The TreeSitter Ruby grammar has been updated; this fixes several issues where Ruby code was parsed incorrectly.
+The Tree-sitter Ruby grammar has been updated; this fixes several issues where Ruby code was parsed incorrectly.