cpufreq: update Documentation/cpu-freq/user-guide.txt to reflect newly merged architecture support

@@ -21,6 +21,8 @@
 1.1 ARM
 1.2 x86
 1.3 sparc64
+1.4 ppc
+1.5 SuperH
 
 2. "Policy" / "Governor"?
 2.1 Policy

@@ -77,6 +79,20 @@
 UltraSPARC-III
 
 
+1.4 ppc
+-------
+
+Several "PowerBook" and "iBook2" notebooks are supported.
+
+
+1.5 SuperH
+----------
+
+The following SuperH processors are supported by cpufreq:
+
+SH-3
+SH-4
+
 
 2. "Policy" / "Governor" ?
 ==========================