fix broken English

several bits were un-clear and there were a number of grammar issues
tweaked a few grammar issues and line wrapped

There were a few grammar issues with the text, and the irony of the file
istructing one to line wrap the documentation at 80 not being line
wrapped itself was too much for me, so I fixed that too.

Conflicts:
	README.rst
Remove superfluous colon
Review corrections

Conflicts:
	admin_manual/installation/installation_source.rst