Canada doesn't hace specific guidance for alley's in it's Wiki. But a lot of editing practices are shared with the US. Here
is the guidance for alleys in the US.
However it's truly up to the management team here in CA. I personally don't map alleys unless they are useful. The ones in your PL give access to houses. So they should be there.
I'd mark them as PLR's and either say no name or label them ALLEY. That way there is some TTS command rather than just "Turn Left on...."
If anyone disagrees go ahead and chime in.
Edit: Oh, and enable the turns.