Added some comments

source/log/include/ILogFacility.hpp

@@ -5,9 +5,17 @@
 
 namespace ugly {
 
+/**
+ * \brief Interface for a generic log-like object.
+ */
 class ILogFacility {
 public:
     ~ILogFacility() = default;
+    /**
+     * \brief Put a message into the log, \c std::vformat -style.
+     * \param fmt Format string.
+     * \param args Format arguments.
+     */
     virtual void vlog(std::string_view fmt, std::format_args args) = 0;
 };