[gegl] docs: fix typo in build.adoc.in

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

commit bdb63e0fd1e3c2b68d6ec8aecca02e945fc61b68
Author: John <jtm home gmail com>
Date:   Tue Mar 2 11:40:47 2021 +0000

    docs: fix typo in build.adoc.in

 docs/build.adoc.in | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/docs/build.adoc.in b/docs/build.adoc.in
index 8261f45f7..cd9975761 100644
--- a/docs/build.adoc.in
+++ b/docs/build.adoc.in
@@ -51,7 +51,7 @@ only required during the build process.
     * link:https://github.com/hodefoting/mrg[mrg]
         (@mrg@) --
     * link:https://gi.readthedocs.io/en/latest/[gobject_introspection]
-        (@gir@) --
+        (@g-ir@) --
     * vapigen
 
   - Dependencies for operations (optional).