[CPUFREQ] update Documentation

- the path to sysfs changed
- add the cpufreq_driver.owner requirement
- clarify another paragraph

Documentation/cpu-freq/cpu-drivers.txt

@@ -41,16 +41,17 @@ on what is necessary:
 1.1 Initialization
 ------------------
 
-First of all, in an __initcall level 7 or later (preferrably
-module_init() so that your driver is modularized) function check
-whether this kernel runs on the right CPU and the right chipset. If
-so, register a struct cpufreq_driver with the CPUfreq core using
-cpufreq_register_driver()
+First of all, in an __initcall level 7 (module_init()) or later
+function check whether this kernel runs on the right CPU and the right
+chipset. If so, register a struct cpufreq_driver with the CPUfreq core
+using cpufreq_register_driver()
 
 What shall this struct cpufreq_driver contain? 
 
 cpufreq_driver.name -		The name of this driver.
 
+cpufreq_driver.owner -		THIS_MODULE;
+
 cpufreq_driver.init -		A pointer to the per-CPU initialization 
 				function.
 
@@ -76,8 +77,7 @@ cpufreq driver registers itself, the per-CPU initialization function
 cpufreq_driver.init is called. It takes a struct cpufreq_policy
 *policy as argument. What to do now?
 
-If necessary, activate the CPUfreq support on your CPU (unlock that
-register etc.).
+If necessary, activate the CPUfreq support on your CPU.
 
 Then, the driver must fill in the following values:
 

Documentation/cpu-freq/user-guide.txt

@@ -132,7 +132,7 @@ the processor shall run at.
 The preferred interface is located in the sysfs filesystem. If you
 mounted it at /sys, the cpufreq interface is located in a subdirectory
 "cpufreq" within the cpu-device directory
-(e.g. /sys/class/cpu/cpu0/cpufreq/ for the first CPU).
+(e.g. /sys/devices/system/cpu/cpu0/cpufreq/ for the first CPU).
 
 cpuinfo_min_freq :		this file shows the minimum operating
 				frequency the processor can run at(in kHz)