perf parse-events: Minor help message improvements

Be more specific and fix a typo.
Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: James Clark <james.clark@arm.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lore.kernel.org/lkml/20230830070753.1821629-1-irogers@google.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/parse-events.y

@@ -342,7 +342,7 @@ PE_NAME opt_pmu_config
 			struct parse_events_error *error = parse_state->error;
 			char *help;
 
-			if (asprintf(&help, "Unabled to find PMU or event on a PMU of '%s'", $1) < 0)
+			if (asprintf(&help, "Unable to find PMU or event on a PMU of '%s'", $1) < 0)
 				help = NULL;
 			parse_events_error__handle(error, @1.first_column,
 						   strdup("Bad event or PMU"),
@@ -368,7 +368,7 @@ PE_NAME sep_dc
 		struct parse_events_error *error = parse_state->error;
 		char *help;
 
-		if (asprintf(&help, "Unabled to find PMU or event on a PMU of '%s'", $1) < 0)
+		if (asprintf(&help, "Unable to find event on a PMU of '%s'", $1) < 0)
 			help = NULL;
 		parse_events_error__handle(error, @1.first_column, strdup("Bad event name"), help);
 		free($1);