Optional, multi-type parameters not labelled as optional in the docs

[gkalpak]

Some optional parameters to functions are not labelled as optional in the docs, inspite being documented as such. This seems to be related to the format used for optional, multi-type parameters.
E.g.:

@param {string=} xyz ...   ---> Appears correctly in the docs 
@param {(string|number)=} xyz ...   ---> Appears correctly in the docs 
@param {string|number=} xyz ...   ---> Does NOT appear correctly in the docs 

(E.g. toJson's pretty parameter: docs vs source)

Could this be an issue with dgeni or should all {x|y=} occurences be replaced with {(x|y)=} ?

[petebacondarwin]

Got a fix in the works