[docs] Additional information about the method getStyleProperty and property style

[Aleksey28]

What is your Scenario?

There is some misunderstanding about the method getStyleProperty in the documentation. It's written that 'the computed value of the CSS' with the link on method getComputedStyle. But if we use properties of two or more words in the 'camelCase' format like 'background Color' as with method getComputedStyle, we'll get the undefined value.

Documentation link: https://testcafe.io/documentation/402670/reference/test-api/domnodestate#members-specific-to-element-nodes

What are you suggesting?

It's needed to note in the documentation, that we should use names in the 'kebab-case' format.

Discussion link: https://teams.microsoft.com/l/message/19:5eb4e942f0f946188ab14b3d8bf960f3@thread.skype/1644226835582?tenantId=e4d60396-9352-4ae8-b84c-e69244584fa4&groupId=f74b7d18-34a4-4c78-b7d5-b56e55ce3236&parentMessageId=1644226835582&teamName=Teams%20Collaborations&channelName=TestCafe&createdTime=1644226835582

What alternatives have you considered?

No response

Additional context

No response