Updated spacing defaults documentation

[radarhere]

Resolves #4367

Updates the defaults for spacing in the documentation, so that text and multiline_text
matches

Pillow/src/PIL/ImageDraw.py

Lines 263 to 270 in a520a43

	def text(
	self,
	xy,
	text,
	fill=None,
	font=None,
	anchor=None,
	spacing=4,

and

Pillow/src/PIL/ImageDraw.py

Lines 353 to 360 in a520a43

	def multiline_text(
	self,
	xy,
	text,
	fill=None,
	font=None,
	anchor=None,
	spacing=4,

For reference, itooks like #1574 just forgot to update the documentation.

[hugovk]

Thanks!