Remove never implemented regex descriptions
Remove never implemented regex descriptions

#6164. The regex replacement was never
implemented. Removing its documentation.

SolidWallOfCode/trafficserver,bryancall/trafficserver,SolidWallOfCode/trafficserver,bryancall/trafficserver,vmamidi/trafficserver,duke8253/trafficserver,duke8253/trafficserver,pbchou/trafficserver,bryancall/trafficserver,pbchou/trafficserver,duke8253/trafficserver,vmamidi/trafficserver,pbchou/trafficserver,SolidWallOfCode/trafficserver,SolidWallOfCode/trafficserver,vmamidi/trafficserver,SolidWallOfCode/trafficserver,pbchou/trafficserver,bryancall/trafficserver,bryancall/trafficserver,bryancall/trafficserver,vmamidi/trafficserver,duke8253/trafficserver,vmamidi/trafficserver,SolidWallOfCode/trafficserver,duke8253/trafficserver,pbchou/trafficserver,vmamidi/trafficserver,pbchou/trafficserver,SolidWallOfCode/trafficserver,duke8253/trafficserver,duke8253/trafficserver