Added description for backport

[ojuschugh1]

This pr fixed issue #620

Rendered

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[apiraino]

In my opinion this additional paragraph can be reduced to a slight edit of the text opening this chapter:

Old version:

There's a steady trickle of patches that need to be ported to the beta and stable branch.

New version:

There's a steady trickle of patches (mostly fixes of severe enough bugs) that need to be ported to the beta and stable branch after they're merged into the master branch.

wdty @ojuschugh1 ?

[ojuschugh1]

Sure @apiraino , I will do this as well. Thanks

[ojuschugh1]

Hi @apiraino , I have fixed the issue that you told me to do. Could you please review it.