footnote for bs4_book differences regarding repo config (rstudio#1264)

Co-authored-by: Christophe Dervieux <[email protected]>
leowill01 · Oct 12, 2021 · 017228e · 017228e
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diff --git a/inst/examples/04-customization.Rmd b/inst/examples/04-customization.Rmd
@@ -195,7 +195,7 @@ Note that for HTML output, **bookdown** requires some additional comment tokens
 
 ## Configuration
 
-We have mentioned `rmd_files` in Section \@ref(usage), and there are more (optional) settings you can configure for a book in `_bookdown.yml`\index{\_bookdown.yml}:
+We have mentioned `rmd_files` in Section \@ref(usage), and there are more (optional) settings you can configure for a book in `_bookdown.yml`\index{\_bookdown.yml}^[For the [`bs4_book()`](#bs4-book) format, the `edit`, `history`, and `view` fields have no effect and similar configuration can be specified with the [repo](#specifying-the-repository) argument of the output function.]:
 
 - `book_filename`: the filename of the main Rmd file, i.e., the Rmd file that is merged from all chapters; by default, it is named `_main.Rmd`.
 - `delete_merged_file`: whether to delete the main Rmd file after the book is successfully rendered.