Merge pull request #103500 from chkno/nixos-YY.MM-not-in-nixpkgs-channels

doc: 20.09 release notes: nixos-YY.MM branches no longer in nixos-channels repo

Changed files
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nixos
doc
manual
release-notes
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nixos/doc/manual/release-notes/rl-2009.xml
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</section>
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<listitem>
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<para>
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Starting with this release, the hydra-build-result
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<literal>nixos-<replaceable>YY.MM</replaceable></literal>
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branches no longer exist in the <link
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xlink:href="https://github.com/nixos/nixpkgs-channels">deprecated
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nixpkgs-channels repository</link>. These branches are now in
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<link xlink:href="https://github.com/nixos/nixpkgs">the main nixpkgs
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repository</link>.
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</para>
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</section>