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/Windows/Process.inc b/llvm/lib/Support/Windows/Process.inc
index 2e9b1c7..612eca5 100644
--- a/llvm/lib/Support/Windows/Process.inc
+++ b/llvm/lib/Support/Windows/Process.inc
@@ -158,7 +158,7 @@
   return std::error_code();
 }
 
-/// \brief Perform wildcard expansion of Arg, or just push it into Args if it
+/// Perform wildcard expansion of Arg, or just push it into Args if it
 /// doesn't have wildcards or doesn't match any files.
 static std::error_code WildcardExpand(const wchar_t *Arg,
                                       SmallVectorImpl<const char *> &Args,