doc: remove broken link

Closes: nodejs#47940
PR-URL: nodejs#47942
Fixes: nodejs#47940
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

doc/api/buffer.md

@@ -189,8 +189,8 @@ The following legacy character encodings are also supported:
   better choice when encoding or decoding ASCII-only text. It is only provided
   for legacy compatibility.
 
-* `'binary'`: Alias for `'latin1'`. See [binary strings][] for more background
-  on this topic. The name of this encoding can be very misleading, as all of the
+* `'binary'`: Alias for `'latin1'`.
+  The name of this encoding can be very misleading, as all of the
   encodings listed here convert between strings and binary data. For converting
   between strings and `Buffer`s, typically `'utf8'` is the right choice.
 
@@ -5508,6 +5508,5 @@ introducing security vulnerabilities into an application.
 [`util.inspect()`]: util.md#utilinspectobject-options
 [`v8::TypedArray::kMaxLength`]: https://v8.github.io/api/head/classv8_1_1TypedArray.html#a54a48f4373da0850663c4393d843b9b0
 [base64url]: https://tools.ietf.org/html/rfc4648#section-5
-[binary strings]: https://developer.mozilla.org/en-US/docs/Web/API/DOMString/Binary
 [endianness]: https://en.wikipedia.org/wiki/Endianness
 [iterator]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Iteration_protocols