DOCS/man: use _name key for mp.command_native

DOCS/man/input.rst

@@ -1355,7 +1355,7 @@ Execution Commands
         ::
 
             local r = mp.command_native({
-                name = "subprocess",
+                _name = "subprocess",
                 playback_only = false,
                 capture_stdout = true,
                 args = {"cat", "/proc/cpuinfo"},

DOCS/man/lua.rst

@@ -849,7 +849,7 @@ strictly part of the guaranteed API.
     - rename ``cancellable`` field to ``playback_only``
     - rename ``max_size`` to ``capture_size``
     - set ``capture_stdout`` field to ``true`` if unset
-    - set ``name`` field to ``subprocess``
+    - set ``_name`` field to ``subprocess``
     - call ``mp.command_native(copied_t)``
     - if the command failed, create a dummy result table
     - copy ``error_string`` to ``error`` field if the string is non-empty