fixup! erts: Updated re documentation to match with pcre2

lib/stdlib/doc/src/re.md

@@ -1337,7 +1337,7 @@ surrogates, are always permitted.
 
 If a range that includes letters is used when caseless matching is set, it
 matches the letters in either case. For example, `[W-c]` is equivalent to
-`[\]\[\\^_`wxyzabc]`, matched caselessly, and in a non-UTF mode, if character
+``[][\^_`wxyzabc]``, matched caselessly, and in a non-UTF mode, if character
 tables for a French locale are in use, `[\xc8-\xcb]` matches accented E
 characters in both cases.