Remove \brief commands from doxygen comments.

This is similar to the LLVM change https://reviews.llvm.org/D46290.

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

Differential Revision: https://reviews.llvm.org/D46320

llvm-svn: 331834
diff --git a/clang/lib/Analysis/ThreadSafetyCommon.cpp b/clang/lib/Analysis/ThreadSafetyCommon.cpp
index 07e3a75..fced17f 100644
--- a/clang/lib/Analysis/ThreadSafetyCommon.cpp
+++ b/clang/lib/Analysis/ThreadSafetyCommon.cpp
@@ -86,7 +86,7 @@
   return ME ? ME->isArrow() : false;
 }
 
-/// \brief Translate a clang expression in an attribute to a til::SExpr.
+/// Translate a clang expression in an attribute to a til::SExpr.
 /// Constructs the context from D, DeclExp, and SelfDecl.
 ///
 /// \param AttrExp The expression to translate.
@@ -146,7 +146,7 @@
     return translateAttrExpr(AttrExp, &Ctx);
 }
 
-/// \brief Translate a clang expression in an attribute to a til::SExpr.
+/// Translate a clang expression in an attribute to a til::SExpr.
 // This assumes a CallingContext has already been created.
 CapabilityExpr SExprBuilder::translateAttrExpr(const Expr *AttrExp,
                                                CallingContext *Ctx) {