[Doc] Organizing changes.tely

[Jean-Charles Malahieude]

Hello all,

In the last days of 2017, just before 2.20 was born, James arranged 
changes.tely such that items don't get just stacked one over the other 
but sort of reflect the organizing of the Notation Reference. I found it 
very wise and useful for the reader, and kept that during the 
development of 2.21.

I took care of moving things around with the branching of stable/2.22 
for the English version and the other translators did their duty…
And I've kept it in French for the moment.

What do you think about having a policy about it, since most of the 
change's entries go with an update to other manuals?


Cheers,
--
Jean-Charles