docs: fix capitalization in doxygen comments

Change-Id: Ibf5ee5119d12d60d382b0acef8dfd08277c18fcb
diff --git a/daemon/common/privilege-helper.hpp b/daemon/common/privilege-helper.hpp
index b26dce6..cdd4d05 100644
--- a/daemon/common/privilege-helper.hpp
+++ b/daemon/common/privilege-helper.hpp
@@ -35,10 +35,12 @@
 class PrivilegeHelper
 {
 public:
-  /** \brief represents a serious seteuid/gid failure
+  /**
+   * \brief Indicates a serious seteuid/setegid failure.
    *
-   *  This should only be caught by main as part of a graceful program termination.
-   *  \note This is not an std::exception and NDN_THROW should not be used.
+   * This should only be caught by main as part of a graceful program termination.
+   *
+   * \note This is not an std::exception and NDN_THROW should not be used.
    */
   class Error
   {