Don't eval last vignette chunk

This adds csv files to the final tar.gz, which we don't want

Author: Bisaloo

vignettes/batch_import.Rmd

@@ -102,6 +102,6 @@ their analysis using another programming language or software.
 It works in a very similar way to `lr_get_spec()` and will create `csv` files 
 with the same file names as the input files (but a different extension).
 
-```{r}
+```{r eval = FALSE}
 lr_convert_tocsv(where = "data", ext = "procspec", subdir = TRUE)
 ```