doc(explorer): Add changelog entry.

[brunomenezes]

Summary

Adding an entry for the changelog for the next release, v3.8.3.

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Name	Status	Preview	Comments	Updated (UTC)
staking	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 6, 2024 11:43pm

[coveralls]

Pull Request Test Coverage Report for Build 10275487594

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 77.511%

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Totals
Change from base Build 10275424122:	0.0%
Covered Lines:	338
Relevant Lines:	401

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💛 - Coveralls

[brunomenezes]

I'll merge it as it is a changelog entry that was missing in the previous merged PR #157