Add docs about ir.trigger

It will be great to have docs abouts ir.trigger

assigned to @pokoli

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Here is review28491002

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New review28491002 at https://codereview.tryton.org/28491002/#ps1

review28491002 updated at https://codereview.tryton.org/28491002/#ps20001

review28491002 updated at https://codereview.tryton.org/28491002/#ps40001

review28491002 updated at https://codereview.tryton.org/28491002/#ps60001

review28491002 updated at https://codereview.tryton.org/28491002/#ps80001

New changeset 553e2a87f691 by Sergi Almacellas Abellana in branch 'default':
Add docs about ir.trigger
http://hg.tryton.org/trytond/rev/553e2a87f691

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closed