Minor typos

[whwang299]

Hi. Thanks for sharing a nice work.

There seem to be some minor typos in the docstrings.

genalog/genalog/text/alignment.py

Lines 203 to 207 in b8b9fba

	Returns:
	a string with formatted alignment.
	'|' is for matching character
	'.' is for substition
	'-' indicates gap

Maybe it should be changed as below?
'.' is for substition → '.' is for substitution
'-' indicates gap → ' ' indicates gap

Thanks.

[laserprec]

Thanks for bringing that up 😄. Will address it in the next release.