edit version history item to reference condor_userlog.
===GT=== #3215
fix doc typos for GLEXEC_RETRIES and GLEXEC_RETRY_DELAY
===GT=== #2415
improve formatting of 7.8.8 version history item
===GT=== #3415
minor edit and HT-ify 7.8.8 version history item.
===GT=== #3443