perf ui browsers: Remove help messages about use of right and arrow keys

They were repurposed for horizontal scrolling, so use just ENTER/ESC in
the help messages.

Cc: Adrian Hunter <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: David Ahern <[email protected]>
Cc: Frederic Weisbecker <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Stephane Eranian <[email protected]>
Cc: Wang Nan <[email protected]>
Fixes: c6c3c02dea40 ("perf hists browser: Implement horizontal scrolling")
Link: http://lkml.kernel.org/n/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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