[PATCH try #1] Kconfig: cleanup block/Kconfig.iosched help descriptions

Modify the help descriptions of block/Kconfig.iosched for clarity, accuracy and consistency. More information is added to each of the I/O scheduler choices and they are also reordered to improve the flow of information to the user. IOSCHED_CFQ is the default because it distributes the bandwidth

[PATCH try #1] Kconfig: cleanup block/Kconfig.iosched help descriptions

Modify the help descriptions of block/Kconfig.iosched for clarity, accuracy and consistency. More information is added to each of the I/O scheduler choices and they are also reordered to improve the flow of information to the user. IOSCHED_CFQ is the default because it distributes the bandwidth