Add author and PR number to changelog (#923)

* Add author and PR number to changelog

* Add links at the bottom of the page

CHANGELOG.md

@@ -2,7 +2,7 @@ Changes
 =======
 
 # 4.20.0 / 2024-07-09
-* [FEATURE] Add feature `ec2_prefer_imdsv2` collect instance metadata preferring the IMDSv2 endpoint.
+* [FEATURE] Add feature `ec2_prefer_imdsv2` collect instance metadata preferring the IMDSv2 endpoint [#857] [@whsbp]
 
 # 4.19.0 / 2024-02-19
 * [FEATURE] Add support for installation of the datadog-fips-proxy package [#853] [@truthbk]
@@ -1063,6 +1063,7 @@ A fix has gone in to `apt` 2.1.0 that relaxes this condition, and plays well wit
 [#850]: https://github.com/DataDog/chef-datadog/issues/850
 [#852]: https://github.com/DataDog/chef-datadog/issues/852
 [#856]: https://github.com/DataDog/chef-datadog/issues/856
+[#857]: https://github.com/DataDog/chef-datadog/issues/857
 [#858]: https://github.com/DataDog/chef-datadog/issues/858
 [#859]: https://github.com/DataDog/chef-datadog/issues/859
 [#860]: https://github.com/DataDog/chef-datadog/issues/860
@@ -1251,3 +1252,4 @@ A fix has gone in to `apt` 2.1.0 that relaxes this condition, and plays well wit
 [@chouetz]: https://github.com/chouetz
 [@vigohe]: https://github.com/vigohe
 [@paulcacheux]: https://github.com/paulcacheux
+[@whsbp]: https://github.com/whsbp