Remove reference to sleepycat database exception.
Remove reference to sleepycat database exception.

troubleshooting-guide.rst:
- Remove references to 'com.sleepycat.je.DatabaseException for http_cookies
  database in harvest-agent-h1 logs', as this issue has been resolved by
  changes made to the heritrix-1.14.2-webcuratortool-2.0.1.jar dependency.

DIA-NZ/webcurator,DIA-NZ/webcurator,DIA-NZ/webcurator,DIA-NZ/webcurator