doc: fix Buffer.allocUnsafe documentation

PR-URL: nodejs#50686
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Marco Ippolito <marcoippolito54@gmail.com>

doc/api/buffer.md

@@ -808,8 +808,8 @@ A `TypeError` will be thrown if `size` is not a number.
 The `Buffer` module pre-allocates an internal `Buffer` instance of
 size [`Buffer.poolSize`][] that is used as a pool for the fast allocation of new
 `Buffer` instances created using [`Buffer.allocUnsafe()`][], [`Buffer.from(array)`][],
-and [`Buffer.concat()`][] only when `size` is less than or equal to
-`Buffer.poolSize >> 1` (floor of [`Buffer.poolSize`][] divided by two).
+and [`Buffer.concat()`][] only when `size` is less than
+`Buffer.poolSize >>> 1` (floor of [`Buffer.poolSize`][] divided by two).
 
 Use of this pre-allocated internal memory pool is a key difference between
 calling `Buffer.alloc(size, fill)` vs. `Buffer.allocUnsafe(size).fill(fill)`.