Error parsing <a> tags with href attributes in subsequent lines

[anarthal]

/**
 * \details This is a broken <a
 *      href="https://example.com">link</a>
 */
struct other
{
};

(Tested with MrDocs develop).

This is valid Doxygen, but causes an error with MrDocs:

An issue occurred during execution.
If you believe this is a bug, please report it at https://github.com/cppalliance/mrdocs/issues
with the following details:
    MrDocs Version: 0.0.2 (Build: )
    Reported From: `src/lib/AST/ParseJavadoc.cpp` at line 571

Extracted 4 declarations in 3ms

Removing the extra newline fixes the issue. This can be problematic because clang-format tends to introduce patterns like the above.