docs/specs/edu: Convert to rST

Convert docs/specs/edu.txt to rST format.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-id: 20230927151205.70930-3-peter.maydell@linaro.org
diff --git a/MAINTAINERS b/MAINTAINERS
index 73ec940..8e10bd0 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1882,6 +1882,7 @@
 M: Jiri Slaby <jslaby@suse.cz>
 S: Maintained
 F: hw/misc/edu.c
+F: docs/specs/edu.rst
 
 IDE
 M: John Snow <jsnow@redhat.com>