JS: Fixed docs description

Author: Napalys

javascript/ql/lib/semmle/javascript/StandardLibrary.qll

@@ -121,7 +121,7 @@ class StringReplaceCall extends DataFlow::MethodCallNode {
 
   /**
    * Holds if this is a global replacement, that is, the first argument is a regular expression
-   * with the `g` flag, or this is a call to `.replaceAll()`.
+   * with the `g` flag or unknown flags, or this is a call to `.replaceAll()`.
    */
   predicate maybeGlobal() {
     RegExp::maybeGlobal(this.getRegExp().tryGetFlags()) or this.getMethodName() = "replaceAll"