Fix whitespace - 4 spaces indent

include/spdlog/sinks/file_sinks.h

@@ -111,8 +111,8 @@ private:
 
     // Rotate files:
     // log.txt -> log.1.txt
-    // log.1.txt -> log2.txt
-    // log.2.txt -> log3.txt
+    // log.1.txt -> log.2.txt
+    // log.2.txt -> log.3.txt
     // log.3.txt -> delete