fix(doc): fix release-notes-5225.md (#5230)

## Issue being fixed or feature implemented
make linter happy, fix failures like
https://gitlab.com/dashpay/dash/-/jobs/3858504407

## What was done?
drop trailing whitespace

## How Has This Been Tested?
`COMMIT_RANGE=1a810ca07d..HEAD ./test/lint/lint-whitespace.sh `
fails on develop, passes on this branch

## Breaking Changes
n/a

## Checklist:
- [x] I have performed a self-review of my own code
- [ ] I have commented my code, particularly in hard-to-understand areas
- [ ] I have added or updated relevant unit/integration/functional/e2e
tests
- [ ] I have made corresponding changes to the documentation

**For repository code-owners and collaborators only**
- [x] I have assigned this pull request to a milestone

doc/release-notes-5225.md

@@ -1,7 +1,7 @@
 Testnet Breaking Changes
 ------------------------
 
-A new testnet only LLMQ has been added. This LLMQ is of the type LLMQ_25_67; this LLMQ is only active on testnet. 
+A new testnet only LLMQ has been added. This LLMQ is of the type LLMQ_25_67; this LLMQ is only active on testnet.
 This LLMQ will not remove the LLMQ_100_67 from testnet; however that quorum (likely) will not form and will perform no role.
 See the [diff](https://github.com/dashpay/dash/pull/5225/files#diff-e70a38a3e8c2a63ca0494627301a5c7042141ad301193f78338d97cb1b300ff9R451-R469) for specific parameters of the LLMQ.