Ensure updateCharacteristic and setCharacteristic method signatures are in sync with updateValue and setValue.

[Supereg]

♻️ Current situation

Currently, updateCharacteristic and setCharacteristic (Service class) don't expose the same method signature as updateValue and setValue (Characteristic class) methods. This was reported in #974.

💡 Proposed solution

This PR adapts the method signatures and adds proper documentation.

⚙️ Release Notes

• Ensure that updateCharacteristic and setCharacteristic (Service class) method signatures are in sync with updateValue and setValue (Characteristic class) methods.

➕ Additional Information

This PR fixes some spelling mistakes.

Testing

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Reviewer Nudging

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[coveralls]

Pull Request Test Coverage Report for Build 3368062083

• 3 of 4 (75.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 51.913%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/lib/Service.ts	2	3	66.67%

Totals
Change from base Build 3359159946:	0.0%
Covered Lines:	5820
Relevant Lines:	10247

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💛 - Coveralls