Clarify documentation on the module usage in `wiring.connect()`

[5aji]

The first argument to connect() is the module that the connections should be added to, but the documentation doesn't state this clearly. It becomes clear once you understand it (the connections must be added to something, and the documentation shows it later) but it tripped me up since I was mentally primed to other constructs that operate on a Module directly (If, FSM, .next etc).

amaranth/amaranth/lib/wiring.py

Lines 1358 to 1402 in f20f042

	def connect(m, *args, **kwargs):
	"""Connect interface objects to each other.
	This function creates connections between ports of several interface objects. (Any number of
	interface objects may be provided; in most cases it is two.)
	The connections can be made only if all of the objects satisfy a number of requirements:
	* Every interface object must have the same set of port members, and they must have the same
	:meth:`dimensions <Member.dimensions>`.
	* For each path, the port members of every interface object must have the same width and initial
	value (for port members corresponding to signals) or constant value (for port members
	corresponding to constants). Signedness may differ.
	* For each path, at most one interface object must have the corresponding port member be
	an output.
	* For a given path, if any of the interface objects has an input port member corresponding
	to a constant value, then the rest of the interface objects must have output port members
	corresponding to the same constant value.
	* When connecting multiple interface objects, at least one connection must be made.
	For example, if :py:`obj1` is being connected to :py:`obj2` and :py:`obj3`, and :py:`obj1.a.b`
	is an output, then :py:`obj2.a.b` and :py:`obj2.a.b` must exist and be inputs. If :py:`obj2.c`
	is an input and its value is :py:`Const(1)`, then :py:`obj1.c` and :py:`obj3.c` must be outputs
	whose value is also :py:`Const(1)`. If no ports besides :py:`obj1.a.b` and :py:`obj1.c` exist,
	then no ports except for those two must exist on :py:`obj2` and :py:`obj3` either.
	Once it is determined that the interface objects can be connected, this function performs
	an equivalent of:
	.. code::
	m.d.comb += [
	in1.eq(out1),
	in2.eq(out1),
	...
	]
	Where :py:`out1` is an output and :py:`in1`, :py:`in2`, ... are the inputs that have the same
	path. (If no interface object has an output for a given path, **no connection at all** is made.)
	The positions (within :py:`args`) or names (within :py:`kwargs`) of the arguments do not affect
	the connections that are made. There is no difference in behavior between :py:`connect(m, a, b)`
	and :py:`connect(m, b, a)` or :py:`connect(m, arbiter=a, decoder=b)`. The names of the keyword
	arguments serve only a documentation purpose: they clarify the diagnostic messages when
	a connection cannot be made.

[whitequark]

The first argument to connect() is the module that the connections should be added to, but the documentation doesn't state this clearly.

I think it does in the guide section, but we should probably just expand the error message to guide to the correct usage, in this case.