Update ogr/abstract/git_project.py

Co-authored-by: Nikola Forró <[email protected]>

Author: majamassarini

ogr/abstract/git_project.py

@@ -632,7 +632,7 @@ def get_file_content(
             ref: Branch or commit.
 
                 Defaults to repo's default branch.
-            headers: Headers to be sent with the request.
+            headers: Additional headers to be sent with the request.
 
                 Defaults to `None`, which means no headers.