Describe the measured tone and vibrance in DarkRoom's own terms

The calibration commits named DarkRoom's default curve after another
product and described vibrance as doing what another editor's does at
the same value. The curve is the DNG SDK's reference, so it is called
that; vibrance is scaled to deliver the strength its value names, as
measured against the photographer's earlier exports. Two test names
follow. The measurements and where they came from are unchanged.

core/dr-pipeline/src/ops/view_transform.rs

@@ -34,9 +34,9 @@ pub const ID: OpId = OpId("view_transform");
 pub const CONTRAST: ParamId = ParamId("contrast");
 pub const WHITE: ParamId = ParamId("white");
 /// TRACES: FR-DEV-3j
-/// Which curve renders: Camera Raw's (D21, the default) or D19's sigmoid.
+/// Which curve renders: the DNG reference (D21, the default) or D19's sigmoid.
 ///
-/// Camera Raw's because it is the one that matches what the photographs were
+/// The reference because it is the one that matches what the photographs were
 /// first developed with: on 60 Lightroom exports with neutral settings it
 /// renders their raws within MSE ~150 of Lightroom's own JPEGs at the default
 /// contrast, where 0.20.0's sigmoid was ~1200 (darker by about 0.7 EV and