fix: improve wording partial reference section

[trueberryless]

Description

As discussed in #12914 there is a small typo in the partial reference section which we at the same time used to rewrite the sentence with @ArmandPhilippot so it sounds better 👍

• Closes Partial reference seems to include confusing boolean #12914

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en/reference/container-reference.mdx	Source changed, localizations will be marked as outdated.

Warnings reference

Icon	Description
🔄️	The source for this localization has been updated since the creation of this pull request, make sure all changes in the source have been applied.

[ArmandPhilippot]

LGTM!