rw stat clarification

[Stephan Mueller <stepmueller@phys.ethz.ch>]

Hi there

/sys/fs/xfs/$FS/stats/stats has a counter "rw" showing read and write 
call counters. The output is actually

rw #writes #reads  // eg first writes, than reads

This is quite confusing (at least for me), when the metric is called 
"rw" suggesting first reads, then writes. Also the docs [1] call it "rw 
- Read/Write Stats" but then list the fields in the correct order

   - xs_write_calls
   - xs_read_calls

May I go ahead and make it

rw #reads #writes

or better not break people's scripts and just add a clarification to 
docs?

   Have a nice day
   stephan

[1] https://xfs.org/index.php/Runtime_Stats#rw_-_Read/Write_Stats