Format include/base comments for Doxygen (see issue #3384)

include/base/cef_atomic_ref_count.h

@@ -58,19 +58,25 @@ class AtomicRefCount {
   explicit constexpr AtomicRefCount(int initial_value)
       : ref_count_(initial_value) {}
 
-  // Increment a reference count.
-  // Returns the previous value of the count.
+  ///
+  /// Increment a reference count.
+  /// Returns the previous value of the count.
+  ///
   int Increment() { return Increment(1); }
 
-  // Increment a reference count by "increment", which must exceed 0.
-  // Returns the previous value of the count.
+  ///
+  /// Increment a reference count by "increment", which must exceed 0.
+  /// Returns the previous value of the count.
+  ///
   int Increment(int increment) {
     return ref_count_.fetch_add(increment, std::memory_order_relaxed);
   }
 
-  // Decrement a reference count, and return whether the result is non-zero.
-  // Insert barriers to ensure that state written before the reference count
-  // became zero will be visible to a thread that has just made the count zero.
+  ///
+  /// Decrement a reference count, and return whether the result is non-zero.
+  /// Insert barriers to ensure that state written before the reference count
+  /// became zero will be visible to a thread that has just made the count zero.
+  ///
   bool Decrement() {
     // TODO(jbroman): Technically this doesn't need to be an acquire operation
     // unless the result is 1 (i.e., the ref count did indeed reach zero).
@@ -79,23 +85,29 @@ class AtomicRefCount {
     return ref_count_.fetch_sub(1, std::memory_order_acq_rel) != 1;
   }
 
-  // Return whether the reference count is one.  If the reference count is used
-  // in the conventional way, a refrerence count of 1 implies that the current
-  // thread owns the reference and no other thread shares it.  This call
-  // performs the test for a reference count of one, and performs the memory
-  // barrier needed for the owning thread to act on the object, knowing that it
-  // has exclusive access to the object.
+  ///
+  /// Return whether the reference count is one.  If the reference count is used
+  /// in the conventional way, a refrerence count of 1 implies that the current
+  /// thread owns the reference and no other thread shares it.  This call
+  /// performs the test for a reference count of one, and performs the memory
+  /// barrier needed for the owning thread to act on the object, knowing that it
+  /// has exclusive access to the object.
+  ///
   bool IsOne() const { return ref_count_.load(std::memory_order_acquire) == 1; }
 
-  // Return whether the reference count is zero.  With conventional object
-  // referencing counting, the object will be destroyed, so the reference count
-  // should never be zero.  Hence this is generally used for a debug check.
+  ///
+  /// Return whether the reference count is zero.  With conventional object
+  /// referencing counting, the object will be destroyed, so the reference count
+  /// should never be zero.  Hence this is generally used for a debug check.
+  ///
   bool IsZero() const {
     return ref_count_.load(std::memory_order_acquire) == 0;
   }
 
-  // Returns the current reference count (with no barriers). This is subtle, and
-  // should be used only for debugging.
+  ///
+  /// Returns the current reference count (with no barriers). This is subtle,
+  /// and should be used only for debugging.
+  ///
   int SubtleRefCountForDebug() const {
     return ref_count_.load(std::memory_order_relaxed);
   }