DOCS/man/options: fix description for testing with all hwdec methods

The comment is not longer true since auto now means auto-safe.
Change to auto-unsafe which is the setting to use to test all methods.

DOCS/man/options.rst

@@ -1334,8 +1334,8 @@ Video
         - If you're not sure, but want hardware decoding always enabled by
           default, put ``hwdec=yes`` into your ``mpv.conf``, and acknowledge that
           this may cause problems.
-        - If you want to test available hardware decoding methods, pass
-          ``--hwdec=auto --hwdec-codecs=all`` and look at the terminal output.
+        - If you want to test all available hardware decoding methods, pass
+          ``--hwdec=auto-unsafe --hwdec-codecs=all`` and look at the terminal output.
         - If you're a developer, or want to perform elaborate tests, you may
           need any of the other possible option values.