perf script: Fix outdated comment for perf-trace-python

perf script: Fix outdated comment for perf-trace-python

Script generated by the '--gen-script' option contains an outdated
comment. It mentions a 'perf-trace-python' document while it has been
renamed to 'perf-script-python'. Fix it.

Signed-off-by: SeongJae Park <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Fixes: 133dc4c39c57 ("perf: Rename 'perf trace' to 'perf script'")
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>