message: [doc][c++] Fix custom buffer link
diff: @@ -114,9 +114,9 @@ class CompactBinaryWriter;
  The `Buffer` template parameter specifies where the serialized payload is
  respectively read from and written to. This constitutes the second layer of
  customization. Bond comes with built-in buffers implemented on top of memory
  -[blobs][blob_reference], `InputBuffer` and `OutputBuffer`, but applications can
  -also define [custom buffers](#custom-buffers) by implementing simple stream
  -interfaces.
  +[blobs][blob_reference], `InputBuffer` and `OutputBuffer`, but applications
  +can also define custom buffers by [implementing simple stream
  +interfaces](#custom-streams).
  The full protocol class names can be unwieldy and it is often convenient to
  define shorter type aliases:
  