playground: Display more keyboard shortcuts

Author: shesek

web/editor.pug

@@ -50,8 +50,12 @@ body
 
           #help-popover(popover)
           #help-contents.card.border-secondary.
-            #[code F11] to toggle full-screen (in all panels) #[br]
-            #[code Ctrl-Space] to auto-complete
+            #[code F11] · Toggle full-screen (in all panels) #[br]
+            #[code Ctrl-F] · Search #[br]
+            #[code Ctrl-G] · Find next #[br]
+            #[code Alt-F] · Persistent search #[br]
+            #[code Ctrl-Shift-F] · Search & replace #[br]
+            #[code Ctrl-Space] · Auto-complete
 
           #editor.card-text