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/ops/vibrance.yaml

@@ -24,9 +24,9 @@ uniforms:
   amount:
     value: vibrance / 100 * 1.3
     doc: |
-      Scaled so that a value here does what the same value of Lightroom's
-      Vibrance does. Measured, not chosen: fitted on 45 Lightroom exports whose
-      only colour setting was Vibrance (about +24), against their raws.
+      Scaled so that a value delivers the strength it names. Measured, not
+      chosen: fitted on 45 of the photographer's earlier exports whose only
+      colour setting was a vibrance of about +24, against their raws.
 
 helpers: [luminance]
 
@@ -66,10 +66,10 @@ tests:
   - name: it_starts_neutral
     expect_active: false
 
-  - name: the_amount_is_lightrooms_scale
+  - name: the_amount_is_the_measured_scale
     why: |
-      Fitted against Lightroom exports: DarkRoom's vibrance at a value does
-      what Lightroom's does at the same value.
+      Fitted against the photographer's earlier exports, so a value delivers
+      the strength it names.
     set: { vibrance: 100 }
     expect: { amount: 1.3 }