Issue 6847 Fixing documentation for secondary_mode (#6851)
Issue 6847 Fixing documentation for secondary_mode (#6851)

Co-authored-by: Vijayanand Subramanian <87deb63a5c692e5f5b3bd08fa868c87c0308df7d@synamedia.com>
bryancall/trafficserver,duke8253/trafficserver,SolidWallOfCode/trafficserver,duke8253/trafficserver,pbchou/trafficserver,vmamidi/trafficserver,bryancall/trafficserver,duke8253/trafficserver,SolidWallOfCode/trafficserver,bryancall/trafficserver,duke8253/trafficserver,vmamidi/trafficserver,SolidWallOfCode/trafficserver,duke8253/trafficserver,duke8253/trafficserver,vmamidi/trafficserver,pbchou/trafficserver,vmamidi/trafficserver,SolidWallOfCode/trafficserver,SolidWallOfCode/trafficserver,SolidWallOfCode/trafficserver,duke8253/trafficserver,bryancall/trafficserver,vmamidi/trafficserver,pbchou/trafficserver,pbchou/trafficserver,bryancall/trafficserver,pbchou/trafficserver,SolidWallOfCode/trafficserver,pbchou/trafficserver,bryancall/trafficserver,vmamidi/trafficserver