doc: rewrite write_*_log sections
authorSitsofe Wheeler <sitsofe@yahoo.com>
Sun, 29 Oct 2017 16:08:51 +0000 (16:08 +0000)
committerSitsofe Wheeler <sitsofe@yahoo.com>
Sun, 29 Oct 2017 19:22:50 +0000 (19:22 +0000)
- Put the big example of how log files work in write_bw_log and make the
  other sections reference that option so there's less repetition.
- Add a note that the write_hist_log depends on log_hist_msec.
- Make a link from log_hist_coarseness to write_hist_log.

Signed-off-by: Sitsofe Wheeler <sitsofe@yahoo.com>

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