Merge pull request #14904 from chris-martin/manual-go2nix-link

nixpkgs manual: fix link to go2nix

doc/languages-frameworks/go.xml

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-  <para>To extract dependency information from a Go package in automated way use <link xlink:href="https://github.com/cstrahan/go2nix">go2nix</link>.</para>
+  <para>To extract dependency information from a Go package in automated way use <link xlink:href="https://github.com/kamilchm/go2nix">go2nix</link>.</para>
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