Merge pull request #1711 from ChristofKaufmann/fix-typo

Fix typo in comment

include/spdlog/spdlog.h

@@ -111,7 +111,7 @@ SPDLOG_API void set_automatic_registration(bool automatic_registration);
 //
 // The default logger object can be accessed using the spdlog::default_logger():
 // For example, to add another sink to it:
-// spdlog::default_logger()->sinks()->push_back(some_sink);
+// spdlog::default_logger()->sinks().push_back(some_sink);
 //
 // The default logger can replaced using spdlog::set_default_logger(new_logger).
 // For example, to replace it with a file logger.