[DOCS]: In general typically prefer explicit imports

[edburns]

Describe the need

@karianna wrote:

src/site/markdown/cookbook/error-handling.md

In general typically prefer explicit imports

//DEPS com.github:copilot-sdk-java:${project.version}
import com.github.copilot.sdk.*;
import com.github.copilot.sdk.events.*;
import com.github.copilot.sdk.json.*;

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