fix bookmarks.yaml syntax

doc/bookmarks.yaml

@@ -6,6 +6,11 @@
 # https://www.bookmarkninja.com
 
 Bookmarks:
+  - Books:
+    - name: Packt
+      href: https://subscription.packtpub.com/playlists
+    - name: O'Reilly Safari
+      href: https://learning.oreilly.com/home/
   - Kotlin:
     - name: Λrrow
       href: https://arrow-kt.io/
@@ -14,8 +19,8 @@ Bookmarks:
       href: https://www.baeldung.com/kotlin-static-methods
   - bash:
     - name: The Terminal Jockey’s Toolbelt
-    - href: https://medium.com/@packetlost/the-terminal-jockeys-toolbelt-4cb1c90aee74
+      href: https://medium.com/@packetlost/the-terminal-jockeys-toolbelt-4cb1c90aee74
   - admin:
     - name: SSHFS - Gentoo Wiki
-    - href: https://wiki.gentoo.org/wiki/SSHFS
+      href: https://wiki.gentoo.org/wiki/SSHFS