Update info about changelog entry generation

[lbarcziova]

The default behaviour was changed in Packit, see packit/packit#2253. There are now also additional env vars exposed in the changelog-entry action. Related to packit/packit#2253

[softwarefactory-project-zuul[bot]]

Build succeeded. https://softwarefactory-project.io/zuul/t/packit-service/buildset/f9a4f9d398994c5f861d2fda86737502

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[softwarefactory-project-zuul[bot]]

Build succeeded. https://softwarefactory-project.io/zuul/t/packit-service/buildset/0e6d94c44b874ef9ae672e0729daef12

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[softwarefactory-project-zuul[bot]]

Build succeeded. https://softwarefactory-project.io/zuul/t/packit-service/buildset/d058bd00bae54c12a52f63647994fa3a

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[nforro]

It looks like the description of copy_upstream_release_description needs to be adjusted as well.

[softwarefactory-project-zuul[bot]]

Build succeeded. https://softwarefactory-project.io/zuul/t/packit-service/buildset/f4350d1c733642f188f49af1d2813416

:heavy_check_mark: pre-commit SUCCESS in 1m 19s

[softwarefactory-project-zuul[bot]]

Build succeeded. https://softwarefactory-project.io/zuul/t/packit-service/buildset/954b34714b3647ed92951a1f72fa925a

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[lbarcziova]

regate

[softwarefactory-project-zuul[bot]]

Build succeeded (gate pipeline). https://softwarefactory-project.io/zuul/t/packit-service/buildset/99b0caac7e1a4e998a055cbfd4376ce0

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