update documentation for header_write
update documentation for header_write

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