doc: improve examples in buffer docs

Documentation for BufferwriteDoubleLE/writeDoubleBE is confusing

PR-URL: #22170
Fixes: #22158
Reviewed-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Anna Henningsen <anna@addaleax.net>

doc/api/buffer.md

@@ -2145,15 +2145,15 @@ endian). `value` *should* be a valid 64-bit double. Behavior is undefined when
 ```js
 const buf = Buffer.allocUnsafe(8);
 
-buf.writeDoubleBE(0xdeadbeefcafebabe, 0);
+buf.writeDoubleBE(123.456, 0);
 
 console.log(buf);
-// Prints: <Buffer 43 eb d5 b7 dd f9 5f d7>
+// Prints: <Buffer 40 5e dd 2f 1a 9f be 77>
 
-buf.writeDoubleLE(0xdeadbeefcafebabe, 0);
+buf.writeDoubleLE(123.456, 0);
 
 console.log(buf);
-// Prints: <Buffer d7 5f f9 dd b7 d5 eb 43>
+// Prints: <Buffer 77 be 9f 1a 2f dd 5e 40>
 ```
 
 ### buf.writeFloatBE(value, offset)