perf script: Fix reference to perf insert instead of perf inject

Amend "perf insert" to "perf inject".

Fixes: e28fb159 ("perf script: Add machine_pid and vcpu")
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Acked-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/20220809123258.9086-1-adrian.hunter@intel.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/Documentation/perf-script.txt

@@ -228,7 +228,7 @@ OPTIONS
 	Instruction Trace decoding.
 
 	The machine_pid and vcpu fields are derived from data resulting from using
-	perf insert to insert a perf.data file recorded inside a virtual machine into
+	perf inject to insert a perf.data file recorded inside a virtual machine into
 	a perf.data file recorded on the host at the same time.
 
 	Finally, a user may not set fields to none for all event types.