Update changelog for 1780 RC1 Build6

[sowbiba]

Questions	Answers
Branch?	1.7.8.x
Description?	Update changelog for 1.7.8.0 RC1 Build 6
Type?	improvement
Category?	CO

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This change is 

[prestonBot]

Hi, thanks for this contribution!

I found some issues with the Pull Request description:

• Your pull request does not seem to fix any issue, consider creating one (see note below) and linking it by writing Fixes #1234.

Would you mind having a look at it? This will help us understand how interesting your contribution is, thank you very much!

About linked issues

Please consider opening an issue before submitting a Pull Request:

• If it's a bug fix, it helps maintainers verify that the bug is effectively due to a defect in the code, and that it hasn't been fixed already.
• It can help trigger a discussion about the best implementation path before a single line of code is written.
• It may lead the Core Product team to mark that issue as a priority, further attracting the maintainers' attention.

(Note: this is an automated message, but answering it will reach a real human)

[matks]

CI is broken but this is because the Block Merge Commit GitHub Action is broken. When release is done we can force the merge.