handbook: 11.4 is EOL - remove it from the introduction

[ygy]

Rubber-stamped :)

[emaste]

documentation/content/en/books/handbook/book.adoc

51

@pauamma_gundo.com noticed that in addition to having 11.4 here it was missing 13.x

Follow-up commit:

diff --git a/documentation/content/en/books/handbook/book.adoc b/documentation/content/en/books/handbook/book.adoc
index 5304fe1939..97d270a8b0 100644
--- a/documentation/content/en/books/handbook/book.adoc
+++ b/documentation/content/en/books/handbook/book.adoc
@@ -48,7 +48,7 @@ endif::[]
 [.abstract-title]
 Abstract
 
-Welcome to FreeBSD! This handbook covers the installation and day to day use of _FreeBSD {rel122-current}-RELEASE_ and _FreeBSD {rel121-current}-RELEASE_.
+Welcome to FreeBSD! This handbook covers the installation and day to day use of _FreeBSD {rel130-current}-RELEASE_ and _FreeBSD {rel122-current}-RELEASE_.
 This book is the result of ongoing work by many individuals.
 Some sections might be outdated.
 Those interested in helping to update and expand this document should send email to the {freebsd-doc}.