Remove duplicate references from release notes

Closes #8360

releaser/releasenotes_writer.go

@@ -59,9 +59,9 @@ This release represents **{{ len .All }} contributions by {{ len $contribsPerAut
 {{- $u3 := index $contribsPerAuthor 2 -}}
 {{- $u4 := index $contribsPerAuthor 3 -}}
 {{- $u1.AuthorLink }} leads the Hugo development with a significant amount of contributions, but also a big shoutout to {{ $u2.AuthorLink }}, {{ $u3.AuthorLink }}, and {{ $u4.AuthorLink }} for their ongoing contributions.
-And a big thanks to [@digitalcraftsman](https://github.com/digitalcraftsman) for his relentless work on keeping the themes site in pristine condition and to [@davidsneighbour](https://github.com/davidsneighbour), [@coliff](https://github.com/coliff) and [@kaushalmodi](https://github.com/kaushalmodi) for all the great work on the documentation site.
+And a big thanks to [@digitalcraftsman](https://github.com/digitalcraftsman) for his relentless work on keeping the themes site in pristine condition.
 {{ end }}
-Many have also been busy writing and fixing the documentation in [hugoDocs](https://github.com/gohugoio/hugoDocs), 
+Many have also been busy writing and fixing the documentation in [hugoDocs](https://github.com/gohugoio/hugoDocs),
 which has received **{{ len .Docs }} contributions by {{ len $docsContribsPerAuthor }} contributors**.
 {{- if  gt (len $docsContribsPerAuthor) 3 -}}
 {{- $u1 := index $docsContribsPerAuthor 0 -}}