fix Issue 12810 - PrimaryExpression grammar does not allow type constructors

List grammars for `immutable(int).init` and `immutable(int)(1)`.
fix Issue 13310 - Old style multiple alias declaration not documented
fix Issue 13329 - AutoDeclarationX grammar lists '=' token and template parameters in the wrong order
Use Phobos style for index.dd code examples
Fix coding style in abi.dd
Fix coding style in arrays.dd
Fix coding style in attribute.dd
Fix coding style in class.dd
Fix coding style in code_coverage.dd
Fix coding style in contracts.dd
Fix coding style in cpp_interface.dd
Fix coding style in cpptod.dd
Fix coding style for ctod.dd
Fix coding style for d-array-article.dd
Fix coding style for ddoc.dd
Fix coding style for declaration.dd
Fix coding style for d-floating-point.dd
Fix coding style for enum.dd
Fix coding style in exception-safe.dd
Fix coding style in expression.dd