[babl] docs: refer to Y in generated reference as Luminance

[Øyvind "pippin" Kolås <ok src gnome org>]

commit 55ff0c41ecee51f51c5c076b714212f89e3ec061
Author: Øyvind Kolås <pippin gimp org>
Date:   Tue Jul 23 00:59:48 2019 +0200

    docs: refer to Y in generated reference as Luminance

 tools/babl-html-dump.c | 25 +++++++++++++++++--------
 1 file changed, 17 insertions(+), 8 deletions(-)
---
diff --git a/tools/babl-html-dump.c b/tools/babl-html-dump.c
index 08db1cd..1a1545c 100644
--- a/tools/babl-html-dump.c
+++ b/tools/babl-html-dump.c
@@ -169,9 +169,25 @@ model_doc (const Babl *babl)
     {
       BablModelFlag flags = babl_get_model_flags (babl);
       if (flags & BABL_MODEL_FLAG_RGB)
+      {
         printf ("RGB");
+
+        if (flags & BABL_MODEL_FLAG_LINEAR)
+          printf (" linear");
+        if (flags & BABL_MODEL_FLAG_NONLINEAR)
+          printf (" with TRC from space");
+        if (flags & BABL_MODEL_FLAG_PERCEPTUAL)
+          printf (" with perceptual (sRGB) TRC");
+      }
       else if (flags & BABL_MODEL_FLAG_GRAY)
-        printf ("Grayscale");
+      {
+        if (flags & BABL_MODEL_FLAG_LINEAR)
+          printf (" Luminance");
+        if (flags & BABL_MODEL_FLAG_NONLINEAR)
+          printf (" Grayscale with TRC from space");
+        if (flags & BABL_MODEL_FLAG_PERCEPTUAL)
+          printf (" Grayscale with perceptual (sRGB) TRC");
+      }
       else if (flags & BABL_MODEL_FLAG_CMYK)
       {
         if (flags & BABL_MODEL_FLAG_INVERTED)
@@ -180,13 +196,6 @@ model_doc (const Babl *babl)
           printf ("CMYK");
       }
 
-      if (flags & BABL_MODEL_FLAG_LINEAR)
-        printf (" linear");
-      if (flags & BABL_MODEL_FLAG_NONLINEAR)
-        printf (" with TRC from space");
-      if (flags & BABL_MODEL_FLAG_PERCEPTUAL)
-        printf (" with perceptual (sRGB) TRC");
-
       if (flags & BABL_MODEL_FLAG_ALPHA)
       {
         if (flags & BABL_MODEL_FLAG_ASSOCIATED)