Improve company module documentation

Documentation improvements as part of the GSoD: https://discuss.tryton.org/t/gsod-project-documentation-for-basic-modules/3186

assigned to @dave

added company type::feature + 1 deleted label

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review296281002 updated at https://codereview.tryton.org/296281002/#ps320011002

review296281002 updated at https://codereview.tryton.org/296281002/#ps326511003

review296281002 updated at https://codereview.tryton.org/296281002/#ps312901003

review296281002 updated at https://codereview.tryton.org/296281002/#ps316531002

review296281002 updated at https://codereview.tryton.org/296281002/#ps326891002

review296281002 updated at https://codereview.tryton.org/296281002/#ps357341002

review296281002 updated at https://codereview.tryton.org/296281002/#ps348151002

review296281002 updated at https://codereview.tryton.org/296281002/#ps334151002

New changeset 4e7e648ccf7a by David Harper in branch 'default':
Improve documentation
https://hg.tryton.org/modules/company/rev/4e7e648ccf7a

added 1 deleted label and removed 1 deleted label

closed

New changeset 914450c58be5 by David Harper in branch 'default':
Improve documentation
https://hg.tryton.org/tryton-env/rev/914450c58be5