[FIX] doc: no longer use customer in API
[FIX] doc: no longer use customer in API

Before this commit the documentation had quite some samples with 'customer', '=', True. Since in V13 this field on the res.partner model no longer exists we've removed it.

closes odoo/odoo#48453

X-original-commit: 2215d803aa35cdd13ab7f989c807bc7f575aaa8e
Signed-off-by: Victor Feyens (vfe) <433cda6c0f0b5b2dac2ef769109a6da90db60157@odoo.com>

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