First pass at logging component doc. (#3943)
First pass at logging component doc. (#3943)

* First pass at logging component doc.

* Add generic Loggers section.

* Right headers.

ifduyue/sentry,mvaled/sentry,looker/sentry,jean/sentry,beeftornado/sentry,gencer/sentry,jean/sentry,JackDanger/sentry,jean/sentry,ifduyue/sentry,mvaled/sentry,gencer/sentry,gencer/sentry,looker/sentry,gencer/sentry,mvaled/sentry,ifduyue/sentry,JackDanger/sentry,looker/sentry,gencer/sentry,mvaled/sentry,beeftornado/sentry,mvaled/sentry,looker/sentry,ifduyue/sentry,jean/sentry,ifduyue/sentry,looker/sentry,mvaled/sentry,JackDanger/sentry,beeftornado/sentry,jean/sentry