perf tools: Fix documentation of verbose options

Option doesn't take a value, make sure the man pages agree. For example:

  $ perf evlist --verbose=1
   Error: option `verbose' takes no value

Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lore.kernel.org/lkml/20210226183145.1878782-1-irogers@google.com


Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>