C++: Correct change note formatting
C++: Correct change note formatting

In Markdown, nested bullet lists are formatted with indented asterisks
rather than double asterisks.

github/codeql,github/codeql,github/codeql,github/codeql,github/codeql,github/codeql,github/codeql,github/codeql,github/codeql,github/codeql,github/codeql,github/codeql,github/codeql,github/codeql,github/codeql