doc: update cluster docs for common issues
doc: update cluster docs for common issues

chitianhao/trafficserver,pbchou/trafficserver,bryancall/trafficserver,davidbz/trafficserver,bryancall/trafficserver,dyrock/trafficserver,clearswift/trafficserver,clearswift/trafficserver,clearswift/trafficserver,chenglongwei/trafficserver,taoyunxing/trafficserver,PSUdaemon/trafficserver,reveller/trafficserver,davidbz/trafficserver,persiaAziz/trafficserver,reveller/trafficserver,PSUdaemon/trafficserver,rahmalik/trafficserver,taoyunxing/trafficserver,rahmalik/trafficserver,persiaAziz/trafficserver,chenglongwei/trafficserver,rahmalik/trafficserver,vmamidi/trafficserver,reveller/trafficserver,chenglongwei/trafficserver,reveller/trafficserver,taoyunxing/trafficserver,taoyunxing/trafficserver,bryancall/trafficserver,duke8253/trafficserver,dyrock/trafficserver,duke8253/trafficserver,clearswift/trafficserver,rpufky/trafficserver,rahmalik/trafficserver,PSUdaemon/trafficserver,rpufky/trafficserver,chitianhao/trafficserver,rahmalik/trafficserver,rpufky/trafficserver,chitianhao/trafficserver,vmamidi/trafficserver,rpufky/trafficserver,duke8253/trafficserver,pbchou/trafficserver,persiaAziz/trafficserver,persiaAziz/trafficserver,reveller/trafficserver,chitianhao/trafficserver,dyrock/trafficserver,duke8253/trafficserver,bryancall/trafficserver,rpufky/trafficserver,taoyunxing/trafficserver,PSUdaemon/trafficserver,pbchou/trafficserver,dyrock/trafficserver,taoyunxing/trafficserver,chitianhao/trafficserver,SolidWallOfCode/trafficserver,persiaAziz/trafficserver,clearswift/trafficserver,rpufky/trafficserver,SolidWallOfCode/trafficserver,persiaAziz/trafficserver,taoyunxing/trafficserver,duke8253/trafficserver,rahmalik/trafficserver,rpufky/trafficserver,bryancall/trafficserver,SolidWallOfCode/trafficserver,PSUdaemon/trafficserver,rpufky/trafficserver,pbchou/trafficserver,clearswift/trafficserver,reveller/trafficserver,PSUdaemon/trafficserver,davidbz/trafficserver,chenglongwei/trafficserver,vmamidi/trafficserver,reveller/trafficserver,reveller/trafficserver,SolidWallOfCode/trafficserver,chenglongwei/trafficserver,davidbz/trafficserver,rahmalik/trafficserver,PSUdaemon/trafficserver,duke8253/trafficserver,taoyunxing/trafficserver,bryancall/trafficserver,duke8253/trafficserver,dyrock/trafficserver,rpufky/trafficserver,pbchou/trafficserver,clearswift/trafficserver,chenglongwei/trafficserver,pbchou/trafficserver,davidbz/trafficserver,davidbz/trafficserver,taoyunxing/trafficserver,rahmalik/trafficserver,PSUdaemon/trafficserver,reveller/trafficserver,rahmalik/trafficserver,chenglongwei/trafficserver,SolidWallOfCode/trafficserver,vmamidi/trafficserver,dyrock/trafficserver,persiaAziz/trafficserver,SolidWallOfCode/trafficserver,dyrock/trafficserver,SolidWallOfCode/trafficserver,chitianhao/trafficserver,clearswift/trafficserver,chenglongwei/trafficserver,clearswift/trafficserver,vmamidi/trafficserver,vmamidi/trafficserver,persiaAziz/trafficserver,chitianhao/trafficserver,PSUdaemon/trafficserver