cubicweb-trustedauth #3694152 Documentation fixes [resolved]

Documentation looks like it is obsolete.
Also some typos and minor errors.

prioritynormal
typeenhancement
done in0.3.1
load1.000
load left0.000
closed by#f0f60c4fcd29 [wdoc] minor fixes (closes #3694152)
patch[wdoc] minor fixes [applied][wdoc] Fix obsolete documentation [applied][wdoc] typo [applied]