Remove \brief commands from doxygen comments.

We've been running doxygen with the autobrief option for a couple of
years now. This makes the \brief markers into our comments
redundant. Since they are a visual distraction and we don't want to
encourage more \brief markers in new code either, this patch removes
them all.

Patch produced by

  for i in $(git grep -l '\\brief'); do perl -pi -e 's/\\brief //g' $i & done

Differential Revision: https://reviews.llvm.org/D46290

llvm-svn: 331272
diff --git a/llvm/lib/Support/GraphWriter.cpp b/llvm/lib/Support/GraphWriter.cpp
index 3718aff..794c6ba 100644
--- a/llvm/lib/Support/GraphWriter.cpp
+++ b/llvm/lib/Support/GraphWriter.cpp
@@ -66,7 +66,7 @@
   return Str;
 }
 
-/// \brief Get a color string for this node number. Simply round-robin selects
+/// Get a color string for this node number. Simply round-robin selects
 /// from a reasonable number of colors.
 StringRef llvm::DOT::getColorString(unsigned ColorNumber) {
   static const int NumColors = 20;