Reword change note

Author: owen-mc

go/ql/lib/change-notes/2025-07-15-path-injection-sanitizers.md

@@ -1,4 +1,5 @@
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 category: minorAnalysis
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-* Remove model `CreateTemp` function, from the `os` package, as a path-injection sink due to proper sanitization by Go. Add check for `os.PathSeparator` in sanitizers for path-injection query.
+* The second argument of the `CreateTemp` function, from the `os` package, is no longer a path-injection sink due to proper sanitization by Go.
+* The query "Uncontrolled data used in path expression" (`go/path-injection`) now detects sanitizing a path by adding `os.PathSeparator` or `\` to the beginning.