Update src/Microsoft.DotNet.XHarness.TestRunners.Xunit/WasmXmlResultWriter.cs

Author: lewing

src/Microsoft.DotNet.XHarness.TestRunners.Xunit/WasmXmlResultWriter.cs

@@ -96,7 +96,7 @@ Expanded Output Buffer (UTF-16 Encoding):
                 var outputChars = MemoryMarshal.Cast<byte, char>(outputBuffer.AsSpan(outputOffset + totalBytesWritten, OutputBlockSize));
                 for (int i = 0; i < base64BytesWritten; i++)
                 {
-                    // Expand each acsii byte to a char write it in the same logical position
+                    // Expand each ascii byte to a char write it in the same logical position
                     // as a char in outputChars eventually filling the output buffer
                     outputChars[i] = (char)base64Written[i];
                 }