Fix inconsistent indentation in interface-tips.md code block

[Copilot]

Addresses review feedback from #118: code block at line 82 used 3-space indentation while the rest of the file uses 4 spaces.

• Changed void Test(); indentation from 3 to 4 spaces in the ITest interface example

// Before
interface ITest
{
   void Test();  // 3 spaces
}

// After
interface ITest
{
    void Test();  // 4 spaces
}

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