Warn if referring version of MySQL reference manual is out of range.
For example, actually wanted to read a document of version 5.*, but read the documentation of the 4.* by mistake. Have you experienced? It is possible to avoid such mistakes by installing the plugin.
You can set the range of documentations version to want to refer (Default 5.0 < version < 5.8), and if referred version of documentation is out of range then this plugin warns like a screen capture.