docs: getAllByName -> getAllByType in example (#67)

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### Summary

Get rid of all `getAllByName` mentions in examples.

Author: thymikee

README.md

@@ -37,8 +37,8 @@ function setAnswer(question, answer) {
 }
 
 test('should verify two questions', () => {
-  const { getAllByName, getByText } = render(<QuestionsBoard {...props} />);
-  const allQuestions = getAllByName(Question);
+  const { getAllByType, getByText } = render(<QuestionsBoard {...props} />);
+  const allQuestions = getAllByType(Question);
 
   setAnswer(allQuestions[0], 'a1');
   setAnswer(allQuestions[1], 'a2');