[PATCH] update -Wall and -Wextra documentation

[Martin Sebor]

A number of warning options are missing from the list shown under
-Wall (for example, -Winit-self, -Wlogical-not-parentheses, and
-Wplacement-new).  The patch adds the missing ones and adjusts
some of the existing ones to maintain an alphabetical order.  It
also makes a couple of minor clarifications to -Wextra, and adds
an example to the -Wplacement-new option.

Martin
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