Documentation: trace/histogram-design: drop doubled words

Drop the doubled words "to" and "the".

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: linux-doc@vger.kernel.org
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Ingo Molnar <mingo@redhat.com>
Link: https://lore.kernel.org/r/20200703212453.30553-3-rdunlap@infradead.org


Signed-off-by: Jonathan Corbet <corbet@lwn.net>