AutoCloseExpandSpace not mentioned in doc

[captbaritone]

I had been frustrated by this #54 and had read all the documentation hoping to find an explanation for why the expansion was happening in the first place. It wasn't until I found #29 while looking through old issue, that I saw I could turn off this behavior by setting:

`g:AutoCloseExpandSpace = 0`

Is there a reason this is not mentioned in the documentation? Are there other settings like this that are not mentioned? If there's anything I can do to help please let me know.