doc: minor cache architecture formatting fixes
doc: minor cache architecture formatting fixes

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