docs: Port "Config parameters" service page to 7.2

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Ports the legacy Config parameters guide into plugin_services/parameters.rst on the 7.2 base branch, converting the legacy Markdown to RST and modernizing it to inject CoreParametersHelper and use get()/has()/all(). Mirrors the reviewed 7.1 port. Resolves docs issue #367.

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• Message in Slack channel #docs-notifications: The reason of blocked label is to set content, structure, and tone in one branch, then backport/cherry pick i...

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Ported from the legacy _plugin_services_parameters.md include, which documented reading the helloworld_api_enabled config parameter via mautic.helper.core_parameters (Mautic\CoreBundle\Helper\CoreParametersHelper). Modernized to inject CoreParametersHelper and call get()/has()/all() per Mautic 7 service conventions, matching issue #366's guidance to update content while porting.

Source: https://raw.githubusercontent.com/mautic/developer-documentation/main/source/includes/_plugin_services_parameters.md

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Thanks for the review, @adiati98! I've addressed the Google.Passive warning.

In docs/plugin_services/parameters.rst, the flagged phrase "to confirm whether a parameter is set" was rewritten in active voice — has() now reads "to confirm whether a parameter exists".

Vale is clean on the changed lines. The update is pushed to this PR.

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Done, @adiati98 — I removed the placeholder note admonition (and its now-unneeded .. vale off / .. vale on wrappers) from docs/plugin_services/parameters.rst. The page now goes straight from the title into the CoreParametersHelper content.

Vale is clean on the changed content. The update is pushed to this PR.