Cleanup: doxygen comments

Also correct some outdated symbol references,
add missing 'name' commands.

source/blender/compositor/intern/COM_ExecutionGroup.cpp

@@ -198,13 +198,13 @@ void ExecutionGroup::execute(ExecutionSystem *graph)
   const bNodeTree *bTree = context.getbNodeTree();
   if (this->m_width == 0 || this->m_height == 0) {
     return;
-  }  /// \note: break out... no pixels to calculate.
+  }  /// \note Break out... no pixels to calculate.
   if (bTree->test_break && bTree->test_break(bTree->tbh)) {
     return;
-  }  /// \note: early break out for blur and preview nodes
+  }  /// \note Early break out for blur and preview nodes.
   if (this->m_numberOfChunks == 0) {
     return;
-  }  /// \note: early break out
+  }  /// \note Early break out.
   unsigned int chunkNumber;
 
   this->m_executionStartTime = PIL_check_seconds_timer();