[llvm-cov] Flesh out some doxygen comments, NFC

llvm-svn: 273772
diff --git a/llvm/tools/llvm-cov/SourceCoverageView.cpp b/llvm/tools/llvm-cov/SourceCoverageView.cpp
index c393ad4..285767e 100644
--- a/llvm/tools/llvm-cov/SourceCoverageView.cpp
+++ b/llvm/tools/llvm-cov/SourceCoverageView.cpp
@@ -6,9 +6,9 @@
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
-//
-// This class implements rendering for code coverage of source code.
-//
+///
+/// \file This class implements rendering for code coverage of source code.
+///
 //===----------------------------------------------------------------------===//
 
 #include "SourceCoverageView.h"