* gnu/packages/ntp.scm (chrony): Update to 4.5.
[source]: Download from GitLab as the original site is not accessible
anymore.
[native-inputs]: Add "bison" and "ruby-asciidoctor".
[synopsis]: Fix a typo.
[description]: Improve formatting.
[home-page]: Change to "https://chrony-project.org/".
Change-Id: I33b053fff0aced37cefab9f3c5df44fe2b9abb0c
Signed-off-by: Zheng Junjie <zhengjunjie@iscas.ac.cn>
77c4c02d41