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/Tooling/Refactoring/AtomicChange.cpp b/clang/lib/Tooling/Refactoring/AtomicChange.cpp
index e4cc6a5..e8b0fdb 100644
--- a/clang/lib/Tooling/Refactoring/AtomicChange.cpp
+++ b/clang/lib/Tooling/Refactoring/AtomicChange.cpp
@@ -15,7 +15,7 @@
 LLVM_YAML_IS_SEQUENCE_VECTOR(clang::tooling::AtomicChange)
 
 namespace {
-/// \brief Helper to (de)serialize an AtomicChange since we don't have direct
+/// Helper to (de)serialize an AtomicChange since we don't have direct
 /// access to its data members.
 /// Data members of a normalized AtomicChange can be directly mapped from/to
 /// YAML string.
@@ -50,7 +50,7 @@
 namespace llvm {
 namespace yaml {
 
-/// \brief Specialized MappingTraits to describe how an AtomicChange is
+/// Specialized MappingTraits to describe how an AtomicChange is
 /// (de)serialized.
 template <> struct MappingTraits<NormalizedAtomicChange> {
   static void mapping(IO &Io, NormalizedAtomicChange &Doc) {
@@ -63,7 +63,7 @@
   }
 };
 
-/// \brief Specialized MappingTraits to describe how an AtomicChange is
+/// Specialized MappingTraits to describe how an AtomicChange is
 /// (de)serialized.
 template <> struct MappingTraits<clang::tooling::AtomicChange> {
   static void mapping(IO &Io, clang::tooling::AtomicChange &Doc) {