doc: remove wrong default value in buffer.md

PR-URL: #19883
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>

doc/api/buffer.md

@@ -2368,9 +2368,10 @@ changes:
 -->
 
 * `value` {integer} Number to be written to `buf`.
-* `offset` {integer} Number of bytes to skip before starting to write. Must satisfy: `0 <= offset <= buf.length - byteLength`.
-* `byteLength` {integer} Number of bytes to write. Must satisfy: `0 < byteLength <= 6`.
-  **Default:** `false`.
+* `offset` {integer} Number of bytes to skip before starting to write.
+  Must satisfy: `0 <= offset <= buf.length - byteLength`.
+* `byteLength` {integer} Number of bytes to write. Must satisfy:
+  `0 < byteLength <= 6`.
 * Returns: {integer} `offset` plus the number of bytes written.
 
 Writes `byteLength` bytes of `value` to `buf` at the specified `offset`.