Fix issue #510 (spelling)

include/spdlog/spdlog.h

@@ -69,7 +69,7 @@ void set_sync_mode();
 
 //
 // Create and register multi/single threaded basic file logger.
-// Basic logger simply writes to given file without any limitatons or rotations.
+// Basic logger simply writes to given file without any limitations or rotations.
 //
 std::shared_ptr<logger> basic_logger_mt(const std::string& logger_name, const filename_t& filename, bool truncate = false);
 std::shared_ptr<logger> basic_logger_st(const std::string& logger_name, const filename_t& filename, bool truncate = false);