[Cin] small changes in Manual

[Phyllis Smith]

Since this thread's subject is "small changes in Manual", I have made some
small changes also to Introduction.tex and AUTHORS.tex which you can see in
the Manual's GIT for clarification purposes.

Although I wish the Manual could be perfect and include everything
possible, that is not practical or achievable.  But working to improve it
within reason is certainly a good goal.
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