knitr now expects the correct comment syntax for the language to correctly parse cell options

backport of #12450

Author: cderv

tests/docs/smoke-all/2023/10/29/6985-b.qmd

@@ -8,5 +8,5 @@ code-fold: true
 ```
 
 ```{js}
-#| file: script.js
+//| file: script.js
 ```

tests/docs/smoke-all/knitr/eng-sql.qmd

@@ -15,8 +15,8 @@ dbWriteTable(con, "mtcars", mtcars)
 ```
 
 ```{sql}
-#| column: margin
-#| connection: con
+--| column: margin
+--| connection: con
 
 select cyl from mtcars limit 5
 ```

tests/docs/test-knitr-sql.qmd

@@ -28,7 +28,7 @@ ORDER BY manufacturer, displ DESC
 New way to write this option
 
 ```{sql}
-#| connection: con
+--| connection: con
 SELECT manufacturer, displ, cty
 FROM mpg
 ORDER BY manufacturer, displ DESC