[MERGE] core_concepts documentation corrections

[Gary Wilson Jr.]

This patch contains several minor changes to core_concepts docs:

* Fixed a couple misspellings.
* Several punctuation, capitalization, and grammar fixes.
* Made all bulleted lists use a common indention.
* Corrected a reST link.
* Removed an extraneous sentence from branches section.

I tried looking for some sort of style guidelines for the documentation, 
but didn't find anything.  Are there any defined standards for the 
documentation?  For example, I noticed that bulleted lists had 
inconsistent indention.  On some, the bullet was in the first column of 
the line, and others it was spaced over one or two spaces.

Gary
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