Update the documentation of types and attributes

Documented the new substring extraction functionality.
Clarified the description of "&priority" and "void".
Also fixed various typos.
Fix typos in BIF documentation

Fixed typos in documentation of hexstr_to_bytestring.
Also added documentation that was missing for function parameters
and return values of other BIFs.
Add documentation for event parameters

Added documentation that was missing for some event parameters, and
fixed documented name of event parameters.
Fixed typo in the Quick Start Guide

Also clarified the instructions about modifying crontab.
Merge remote-tracking branch 'origin/master' into topic/dnthayer/doc-updates
Fix typo in Bro 2.2 NEWS

The examples about string indexing for Bro 2.2 had a typo (comma should
be colon).
Merge remote-tracking branch 'origin/topic/dnthayer/doc-updates'

* origin/topic/dnthayer/doc-updates:
  Fix typo in Bro 2.2 NEWS
  Fixed typo in the Quick Start Guide
  Add documentation for event parameters
  Fix typos in BIF documentation
  Update the documentation of types and attributes

BIT-1109 #merged
Updating submodule(s).

 [nomail]