[gimp] devel-docs: Fix id of PROP_BLEND_SPACE

[Tobias <et src gnome org>]

commit 9908c14fbf65da45dd80893d534da367f2d2c9f1
Author: Tobias Ellinghaus <me houz org>
Date:   Mon Mar 30 11:04:59 2020 +0200

    devel-docs: Fix id of PROP_BLEND_SPACE

 devel-docs/xcf.txt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/devel-docs/xcf.txt b/devel-docs/xcf.txt
index 6877019683..1792b71dd7 100644
--- a/devel-docs/xcf.txt
+++ b/devel-docs/xcf.txt
@@ -1223,7 +1223,7 @@ PROP_COMPOSITE_SPACE (since GIMP 2.10.0, essential, commit 8634b5cbc31)
   PROP_COMPOSITE_SPACE.
 
 PROP_BLEND_SPACE (since GIMP 2.10.0, essential, commit 8634b5cbc31)
-  uint32  36         Type identification
+  uint32  37         Type identification
   uint32  4          Four bytes of payload
   int32   space      Composite space of the layer; one of:
                        1: RGB (linear)