[pygobject] Fix section target links

[Christoph Reiter <creiter src gnome org>]

commit 8f463b2f07ab9ed5514e2bd45672640c4b9e61be
Author: Dan Yeaw <dan yeaw me>
Date:   Thu Mar 8 06:53:15 2018 -0500

    Fix section target links
    
    Signed-off-by: Dan Yeaw <dan yeaw me>

 docs/devguide/dev_environ.rst | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/docs/devguide/dev_environ.rst b/docs/devguide/dev_environ.rst
index dff229a1..07a0a2d9 100644
--- a/docs/devguide/dev_environ.rst
+++ b/docs/devguide/dev_environ.rst
@@ -231,7 +231,7 @@ do the following additional steps:
 Work on PyGObject
 *****************
 
-.. _platform-ind-steps
+.. _platform-ind-steps:
 
 Platform Independent Steps
 ==========================
@@ -249,7 +249,7 @@ additional steps:
     pipenv install flake8
     pipenv shell
 
-.. _additional-platform-steps
+.. _additional-platform-steps:
 
 Additional Steps Per Platform
 =============================