[JENKINS-72179] Show description of boolean build parameter values

[daniel-beck]

See JENKINS-72179. Amends #3921.

Testing done

Navigated to the affected page:

Proposed changelog entries

• Show the description of boolean build parameter values on the Parameters view. (regression in 2.179)

Proposed upgrade guidelines

N/A

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@mention

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[jtnord]

I do find it strange though that (all the?) other form taglibs can take a description directly yet checkbox does not.