[PATCH] Fix sphinx-build warning.

[Martin Liška]

RemovedInSphinx40Warning: app.add_lexer() API changed; Please give lexer class 
instead of instance
Ready for master?
Thanks,
Martin

gcc/ada/ChangeLog:

        * doc/share/conf.py: Fix Sphinx 4.0.x error.
---
 gcc/ada/doc/share/conf.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/gcc/ada/doc/share/conf.py b/gcc/ada/doc/share/conf.py
index 755c3a682f8..0f7f963d3c7 100644
--- a/gcc/ada/doc/share/conf.py
+++ b/gcc/ada/doc/share/conf.py
@@ -144,5 +144,5 @@ texinfo_documents = [
 
 
 def setup(app):
-    app.add_lexer('ada', ada_pygments.AdaLexer())
-    app.add_lexer('gpr', ada_pygments.GNATProjectLexer())
+    app.add_lexer('ada', ada_pygments.AdaLexer)
+    app.add_lexer('gpr', ada_pygments.GNATProjectLexer)
--
2.31.1