apply change-note suggestions from doc review

Co-authored-by: Sam Browning <106113886+sabrowning1@users.noreply.github.com>

ruby/ql/src/change-notes/2023-01-06-badly-anchored-regex.md

@@ -1,5 +1,5 @@
 ---
 category: newQuery
 ---
-* Added a new query, `rb/regex/badly-anchored-regexp` to detect regular expression validators that use `^` and `$` 
-  as anchors and thus might match a single line instead of the entire string.
+* Added a new query, `rb/regex/badly-anchored-regexp`, to detect regular expression validators that use `^` and `$` 
+  as anchors and therefore might match only a single line of a multi-line string.