Fixed error when setting max file size on 32-Bit systems

docs/content/doc/setup/config.md

@@ -153,6 +153,7 @@ ratelimit:
 files:
   # The path where files are stored
   basepath: ./files # relative to the binary
-  # The maximum size of a file, in bytes.
-  maxsize: 21474836480 # 20 MB
+  # The maximum size of a file, as a human-readable string.
+  # Warning: The max size is limited 2^64-1 bytes due to the underlying datatype
+  maxsize: 20MB
 {{< /highlight >}}