Update src/content/compatibility-flags/to-string-tag.md

Author: ToriLindsay

src/content/compatibility-flags/to-string-tag.md

@@ -14,4 +14,4 @@ disable_flag: "do_not_set_tostring_tag"
 A change was made to set the Symbol.toStringTag on all Workers API objects
 in order to fix several spec compliance bugs. Unfortunately it turns out
 that was more breaking than expected. The `do_not_set_tostring_tag`  compat
-flag restores the original behavior for compat dates before 2024-09-26
+flag restores the original behavior with compatibility dates of 2024-09-26 or earlier.