Fix Helm chart docs

[adriangonz]

What this PR does / why we need it:
Fix template for Helm chart docs, which was breaking the options table.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

[adriangonz]

/cc @RafalSkolasinski @axsaucedo

[seldondev]

Tue Jul 28 12:37:22 UTC 2020
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-2207/1.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2207 --build=1

[seldondev]

Tue Jul 28 12:37:26 UTC 2020
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-2207/2.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2207 --build=2

[RafalSkolasinski]

If if and else have no - why did they decided the have a trailing - in the end...

[adriangonz]

They do magic things. I think that the - at the beginning removes the previous new line. And the - at the end, removes the following new line (both cases if there is any).

[seldondev]

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This pull-request has been approved by: RafalSkolasinski

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