book: update nl

Updated via the `update-book.yml` GitHub workflow.

Author: dscho

external/book/content/book/nl/v2/_index.html

@@ -8,7 +8,7 @@
   language_code: nl
   front_page: true
   repository_url: https://github.com/progit/progit2-nl
-  sha: ba111514ac4d6b7009a799d0861efef636d1e7db
+  sha: e170855ac1d8ad975c2ac2c4771ca16e3ef8ff31
   ebook_pdf: https://github.com/progit/progit2-nl/releases/download/2.1.117/progit.pdf
   ebook_epub: https://github.com/progit/progit2-nl/releases/download/2.1.117/progit.epub
 page_title: Git - Book

external/book/sync/book-nl.sha

@@ -1 +1 @@
-ba111514ac4d6b7009a799d0861efef636d1e7db
+e170855ac1d8ad975c2ac2c4771ca16e3ef8ff31