manpage: remove aphasemeter examples

Apparently this filter is broken in a weird way, which even makes some
libavfilter functions segfault in certain conditions. Don't waste time
with it and just remove the examples.

Also adjust the "life" example description (certainly this filter is
100% worthless, but the example does demonstrate how to use source
filters without any available input).

DOCS/man/options.rst

@@ -5246,9 +5246,6 @@ Miscellaneous
 
     .. admonition:: Examples
 
-        - ``--lavfi-complex='[aid1] asplit [ao] [t] ; [t] aphasemeter [vo]'``
-          Play audio track 1, and visualize it as video using the ``aphasemeter``
-          filter.
         - ``--lavfi-complex='[aid1] [aid2] amix [ao]'``
           Play audio track 1 and 2 at the same time.
         - ``--lavfi-complex='[vid1] [vid2] vstack [vo]'``
@@ -5256,13 +5253,11 @@ Miscellaneous
           both tracks need to have the same width, or filter initialization
           will fail (you can add ``scale`` filters before the ``vstack`` filter
           to fix the size).
-        - ``--lavfi-complex='[aid1] asplit [ao] [t] ; [t] aphasemeter [t2] ; [vid1] [t2] overlay [vo]'``
-          Play audio track 1, and overlay its visualization over video track 1.
         - ``--lavfi-complex='[aid1] asplit [t1] [ao] ; [t1] showvolume [t2] ; [vid1] [t2] overlay [vo]'``
           Play audio track 1, and overlay the measured volume for each speaker
           over video track 1.
         - ``null:// --lavfi-complex='life [vo]'``
-          Conways' Life Game.
+          A libavfilter source-only filter (Conways' Life Game).
 
     See the FFmpeg libavfilter documentation for details on the available
     filters.