cubicweb-container #2741598 doc: update [resolved]

It is currently a bit lacking.

prioritynormal
typeenhancement
done in1.0.1
load0.200
load left0.000
closed by#6838f2b352b9 [doc] update it, put useful practical information within (closes #2741598)
patch[doc] update it, put useful practical information within (closes #2741598) [applied]