Improve cache.directory and cache.h2CacheSize documentation
Improve cache.directory and cache.h2CacheSize documentation

Change-Id: Ic6c599ee035d7231c5796204e8edd98778d7e872

joshuawilson/merrit,qtproject/qtqa-gerrit,WANdisco/gerrit,MerritCR/merrit,qtproject/qtqa-gerrit,joshuawilson/merrit,joshuawilson/merrit,MerritCR/merrit,WANdisco/gerrit,gerrit-review/gerrit,gerrit-review/gerrit,gerrit-review/gerrit,MerritCR/merrit,WANdisco/gerrit,joshuawilson/merrit,MerritCR/merrit,WANdisco/gerrit,GerritCodeReview/gerrit,GerritCodeReview/gerrit,gerrit-review/gerrit,GerritCodeReview/gerrit,MerritCR/merrit,GerritCodeReview/gerrit,GerritCodeReview/gerrit,WANdisco/gerrit,joshuawilson/merrit,qtproject/qtqa-gerrit,joshuawilson/merrit,gerrit-review/gerrit,qtproject/qtqa-gerrit,GerritCodeReview/gerrit,qtproject/qtqa-gerrit,WANdisco/gerrit,MerritCR/merrit,qtproject/qtqa-gerrit,gerrit-review/gerrit,joshuawilson/merrit,gerrit-review/gerrit,MerritCR/merrit,joshuawilson/merrit,GerritCodeReview/gerrit,qtproject/qtqa-gerrit,MerritCR/merrit,GerritCodeReview/gerrit,WANdisco/gerrit