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/view.rs

@@ -51,17 +51,17 @@ pub const SCENE_GREY: f32 = 0.13;
 /// Display-linear middle grey — what a camera JPEG shows a grey card as.
 pub const DISPLAY_GREY: f32 = 0.18;
 
-/// The default contrast: the sigmoid's log-log slope `n`, and for Camera
-/// Raw's curve a power of `DEFAULT_CONTRAST / REFERENCE_CONTRAST` about grey.
+/// The default contrast: the sigmoid's log-log slope `n`, and for the DNG
+/// reference curve a power of `DEFAULT_CONTRAST / REFERENCE_CONTRAST` about grey.
 ///
 /// Fitted, not chosen: on Lightroom 6 exports whose look settings were neutral,
-/// Camera Raw's curve matched the exports best with the input bent by about
+/// the DNG reference curve matched the exports best with the input bent by about
 /// 1.08 (held-out MSE 224 at 1.4, ~150 at 1.5). The sigmoid, which is no longer
 /// the default, fitted best near 1.7 and is better at 1.5 than at 1.4.
 pub const DEFAULT_CONTRAST: f32 = 1.5;
 
 /// The contrast at which each curve is its own reference: the sigmoid's match
-/// to the retired base curve (see the module note), and Camera Raw's table
+/// to the retired base curve (see the module note), and the reference table
 /// untouched.
 pub const REFERENCE_CONTRAST: f32 = 1.4;
 
@@ -237,7 +237,7 @@ mod tests {
     fn the_reference_stays_close_to_the_retired_curve() {
         // TRACES: FR-DEV-3j | FR-DEV-3e
         // D19's promise, now kept by the sigmoid at its reference contrast
-        // rather than by the default (D21 moved the default to Camera Raw's
+        // rather than by the default (D21 moved the default to the DNG reference
         // curve): the midtones do not move by more than a third of a stop
         // from the retired base curve.
         let s = Sigmoid::new(REFERENCE_CONTRAST, DEFAULT_WHITE);