Update c++-quiz.md

[ayush-yadavv]

Added Q107 - Which of the following is the correct syntax to print the message in C++ language?

• Out <<"Hello world!
• Cout << Hello world! ;
• cout <<"Hello world!";
• None of the above

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This PR is ready for review and meets the requirements set out
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DOD

• I have added new quiz{'s}
• I have added new reference link{'s}
• I have made small correction/improvements

Changes / Instructions

Issue #6136

Relocated Q82 from c-(programming-language) to C++ as Q107. That is

Q107. Which of the following is the correct syntax to print the message in C++ language?

• Out <<"Hello world!
• Cout << Hello world! ;
• cout <<"Hello world!";
• None of the above

[Ebazhanov]

Thank you @ayush-yadavv for new question with reference! 👍

[Ebazhanov]

@all-contributors please add @ayush-yadavv for design, code

[allcontributors]

@Ebazhanov

@ayush-yadavv already contributed before to design, code