DOCS/input: fix typo "NANME" -> "NAME"

DOCS/man/input.rst

@@ -581,7 +581,7 @@ Remember to quote string arguments in input.conf (see `Flat command syntax`_).
         instead. (Unlike the underlying OS mechanisms, the mpv command cannot
         start a process with empty environment. Fortunately, that is completely
         useless.) The format of the list is as in the ``execle()`` syscall. Each
-        string item defines an environment variable as in ``NANME=VALUE``.
+        string item defines an environment variable as in ``NAME=VALUE``.
 
         On Lua, you may use ``utils.get_env_list()`` to retrieve the current
         environment if you e.g. simply want to add a new variable.