rse/units: typofix of dropdown class name

rkdarst · rkdarst · commit db79c6c9a1eb · 2025-02-20T21:24:20.000+02:00
diff --git a/rse/units.rst b/rse/units.rst
@@ -83,7 +83,7 @@ Job title?  All of these can be adapted to what makes the most sense
 for your school.
 
 .. admonition:: School of Science practices
-   :classes: dropdown
+   :class: dropdown
 
    At the School of Science our arrangement is:
 
