book: update en

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

Author: dscho

Diff for: _sync_state/book-en.sha

@@ -1 +1 @@
-6a355e607cdf3ec3819d3a9520610ca1e7f5a59e
+88e48c69a12bcbff35e21837dc777759452a8197

Diff for: content/book/en/v2/_index.html

@@ -7,10 +7,10 @@
   language_code: en
   front_page: true
   repository_url: https://github.com/progit/progit2
-  sha: 6a355e607cdf3ec3819d3a9520610ca1e7f5a59e
-  ebook_pdf: https://github.com/progit/progit2/releases/download/2.1.421/progit.pdf
-  ebook_epub: https://github.com/progit/progit2/releases/download/2.1.421/progit.epub
-  ebook_mobi: https://github.com/progit/progit2/releases/download/2.1.421/progit.mobi
+  sha: 88e48c69a12bcbff35e21837dc777759452a8197
+  ebook_pdf: https://github.com/progit/progit2/releases/download/2.1.422/progit.pdf
+  ebook_epub: https://github.com/progit/progit2/releases/download/2.1.422/progit.epub
+  ebook_mobi: https://github.com/progit/progit2/releases/download/2.1.422/progit.mobi
 page_title: Git - Book
 url: "/book/en/v2.html"
 aliases: