Add ticks to all arguments referenced in docstrings

@JoeZiminski @chrishalcrow @h-mayorquin

Discussion in #3068 (specifically this thread)

In the library we've been a bit inconsistent about referencing other arguments inside docstrings. We had originally agreed on ticks, so for example

def a_function(a, b):
    """
    Parameters
    ----------
    a : array
        the data
    b : bool
        whether to scale the data in `a`
    """

Does that sound good to everyone and something to add while working on numpydoc conventions?

Start by reviewing the discussion in issue #3068, especially the linked pull-request thread, to confirm the agreed numpydoc convention. Search the library docstrings for arguments referenced without ticks and update those references consistently. Done means all referenced arguments use backticks as in the example.