tools/nolibc: drop outdated example from overview comment

This behaviour was changed in commit a7604ba ("tools/nolibc/sys:
make open() take a vararg on the 3rd argument").

Signed-off-by: Louis Taylor <louis@kragniz.eu>
Link: https://lore.kernel.org/r/20250306184147.208723-4-louis@kragniz.eu
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>

Author: kragniz

tools/include/nolibc/nolibc.h

@@ -31,8 +31,7 @@
  *   - The third level is the libc call definition. It exposes the lower raw
  *     sys_<name>() calls in a way that looks like what a libc usually does,
  *     takes care of specific input values, and of setting errno upon error.
- *     There can be minor variations compared to standard libc calls. For
- *     example the open() call always takes 3 args here.
+ *     There can be minor variations compared to standard libc calls.
  *
  * The errno variable is declared static and unused. This way it can be
  * optimized away if not used. However this means that a program made of