[MERGE] core_concepts documentation corrections

[Ian Clatworthy]

Gary Wilson Jr. wrote:

> Ok, I think the only list here that meets the simple, continuation of
> the main clause's thought is the one in section 1.2.2 Revision.  I have
> dropped the ending punctuation for those list items.

Thanks.

bb:approve

> What about the indention of the lists?  The Apple Style Guide does not
> seem to be geared for plain text documentation.  In the Python
> documentation's reStructuredText Primer source [1], they put bullets in
> the first column of the line.  My patch does the same.

I think that is a good convention. As I'm heading off now on holidays,
can I ask you to make that an explicit guideline on the wiki page please?

Ian C.