Blurb:: relative scaling of statistical metrics when adapting UQ surrogates

Description:: When adapting a UQ surrogate model, the \c relative
option indicates that the change is measured relative to the current
reference value (which evolves during the refinement), such that the
convergence tolerance controls the relative change.

<b> Default Behavior </b>

<b> Expected Output </b>

<b> Usage Tips </b>

<b> Additional Discussion </b>

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