[PATCH] Update documentation.

[Matt Arsenault]

First feature is not CPU subtype anymore since r134127

http://llvm-reviews.chandlerc.com/D591

Files:
  include/llvm/MC/SubtargetFeature.h

Index: include/llvm/MC/SubtargetFeature.h
===================================================================
--- include/llvm/MC/SubtargetFeature.h
+++ include/llvm/MC/SubtargetFeature.h
@@ -62,10 +62,8 @@
 ///
 /// SubtargetFeatures - Manages the enabling and disabling of subtarget
 /// specific features.  Features are encoded as a string of the form
-///   "cpu,+attr1,+attr2,-attr3,...,+attrN"
+///   "+attr1,+attr2,-attr3,...,+attrN"
 /// A comma separates each feature from the next (all lowercase.)
-/// The first feature is always the CPU subtype (eg. pentiumm).  If the CPU
-/// value is "generic" then the CPU subtype should be generic for the target.
 /// Each of the remaining features is prefixed with + or - indicating whether
 /// that feature should be enabled or disabled contrary to the cpu
 /// specification.
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