minor fix to pachyderm example (doc paths)

[RafalSkolasinski]

What this PR does / why we need it:

Fixes path refering to pachderm examples in docs.

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[RafalSkolasinski]

/approve

[seldondev]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: RafalSkolasinski

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[seldondev]

Tue Jan 5 18:27:59 UTC 2021
The logs for [pr-build] [1] will show after the pipeline context has finished.
https://github.com/SeldonIO/seldon-core/blob/gh-pages/jenkins-x/logs/SeldonIO/seldon-core/PR-2813/1.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2813 --build=1

[seldondev]

Tue Jan 5 18:28:14 UTC 2021
The logs for [lint] [2] will show after the pipeline context has finished.
https://github.com/SeldonIO/seldon-core/blob/gh-pages/jenkins-x/logs/SeldonIO/seldon-core/PR-2813/2.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2813 --build=2