perf help: Change 'usage' to 'Usage' for consistency

Capitalize 'usage' to make it consistent with all the other 'Usage' in
the codes, e.g., usage_builtin.

Signed-off-by: Yunlong Song <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: David Ahern <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Ramkumar Ramachandra <[email protected]>
Cc: Sriram Raghunathan <[email protected]>
Cc: Wang Nan <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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