src: fix a typo in the comment

withing -> within

PR-URL: #23078
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Gus Caplan <me@gus.host>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>

Author: gireeshpunathil

src/node_options.h

@@ -288,7 +288,7 @@ class OptionsParser {
     }
   };
 
-  // Represents a field of type T withing `Options` that can be looked up
+  // Represents a field of type T within `Options` that can be looked up
   // as a C++ member field.
   template <typename T>
   class SimpleOptionField : public OptionField<T> {