Embedded argument support for examples in libdoc

[JFoederer]

When writing examples using libdoc, you typically want to use concrete examples with clarifying arguments. However, when you do that using embedded arguments, libdoc can no longer link the keyword to its definition.

Consider this snippet. The keyword from the example is not being linked:

@keyword("Shout ${n} cheers for")
def hurray(self, n:int, person:str):
    """Cheer them on as much as you like!
    
    Example:
    | `Shout 3 cheers for` | Robot |
    """