Add news item for #795

Author: cpsievert

NEWS.md

@@ -37,6 +37,9 @@
 
 * Filter controls in the popovers of `DT::datatable()` tables now better match the current Bootstrap theme and are responsive to the dark mode setting in Bootstrap 5.3. (#267, #775).
 
+* A double border no longer appears when an accordion is used inside a `sidebar(open="always")` context. (#795)
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 # bslib 0.5.1
 
 ## New features