book: update sl

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

Author: ttaylorr

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

@@ -8,7 +8,7 @@
   language_code: sl
   front_page: true
   repository_url: https://github.com/progit/progit2-sl
-  sha: 46f2df83d200d2547525e06ababb539643b19fd3
+  sha: 16dcf83d9eaa6256fd962b6652f30d6b767f40a1
 page_title: Git - Book
 url: "/book/sl/v2.html"
 aliases:

external/book/sync/book-sl.sha

@@ -1 +1 @@
-46f2df83d200d2547525e06ababb539643b19fd3
+16dcf83d9eaa6256fd962b6652f30d6b767f40a1