Clarify comments for WebSettings.
Clarify comments for WebSettings.

setLoadsImagesAutomatically
getLoadsImagesAutomatically
setBlockNetworkImage
getBlockNetworkImage
setBlockNetworkLoads
getBlockNetworkLoads

Change-Id: Ic1486266a77254044425cdb51cce5c982ea0617c

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base