doc: posix: mark putmsg as supported

Mark `putmsg()` as implemented but will fail with ``ENOSYS``
Was missing on the documentation before.

signed-off-by: Gaetan Perrot <[email protected]>

Author: moonlight83340

doc/services/portability/posix/conformance/index.rst

@@ -109,7 +109,7 @@ POSIX System Interfaces
     _XOPEN_CRYPT, -1,
     _XOPEN_REALTIME, -1,
     _XOPEN_REALTIME_THREADS, -1,
-    :ref:`_XOPEN_STREAMS<posix_option_xopen_streams>`, -1, :kconfig:option:`CONFIG_NET_SOCKETS`
+    :ref:`_XOPEN_STREAMS<posix_option_xopen_streams>`, -1, :ref:`†<posix_undefined_behaviour>`
     _XOPEN_UNIX, -1,
 
 POSIX Shell and Utilities

doc/services/portability/posix/option_groups/index.rst

@@ -509,7 +509,7 @@ _XOPEN_STREAMS
     getpmsg(),
     ioctl(),yes
     isastream(),
-    putmsg(),
+    putmsg(), yes (will fail with ``ENOSYS``:ref:`†<posix_undefined_behaviour>`)
     putpmsg(),