fix: add escaped closing docblock to escaped sequences

[bshaffer]

The sequence {@*} is valid in PHPdoc as an escape sequence for */. See https://manual.phpdoc.org/HTMLframesConverter/default/phpDocumentor/tutorial_phpDocumentor.howto.pkg.html#basics.desc

New 1.2.0rc1: If you need to use the closing comment "/" in a DocBlock, use the special escape sequence "{@}."

However, in our classfile, the sequence {@*} is now causing the following error:

Running phpdoc to generate structure.xml... 
In Process.php line 271:
                                                                                                                                                                                  
  The command "'phpdoc' '--visibility' 'public,protected,private,internal' '-d' 'src' '--template' 'xml' '--target' 'out'" failed.                                                                                                                                                                           
                                                                                                                                                                                  
  Exit Code: 1(General error)

  Error Output:                                                                                                                                                                   
  ================                                                                                                                                                                
  In docblock.xml.twig line 10:                                                                                                                                                   
                                                                                                                                                                                  
    An exception has been thrown during the rendering of a template ("The arguments array must contain 3 items, 0 given") in "docblock.xml.twig" at line 10 
    
     In DescriptionDescriptor.php line 79:                                                                                                                                           
    The arguments array must contain 3 items, 0 given        

This change updates the regex so that the sequence {@*} is escaped and kept as a literal instead of being parsed as a tag.