docs: Add book to process/kernel-docs.rst

Include to process/kernel-docs.rst a book on Linux system administration
published in May, 2023 (with ISBN 978-1098109035).
Signed-off-by: Carlos Bilbao <carlos.bilbao@amd.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20230803142417.965313-1-carlos.bilbao@amd.com

Documentation/process/kernel-docs.rst

@@ -118,6 +118,15 @@ Published books
       :ISBN: 978-0672329463
       :Notes: Foundational book
 
+    * Title: **Practical Linux System Administration: A Guide to Installation, Configuration, and Management, 1st Edition**
+
+      :Author: Kenneth Hess
+      :Publisher: O'Reilly Media
+      :Date: May, 2023
+      :Pages: 246
+      :ISBN: 978-1098109035
+      :Notes: System administration
+
 .. _ldd3_published:
 
     * Title: **Linux Device Drivers, 3rd Edition**