Revised according to reviewer comments.
Revised according to reviewer comments.

* Reworded paragraph on float vs. double functions and how Chapel uses overloading to
simplify their naming and selection.
* Replace :kbd:`foo` with ``foo`` throughout.
* Removed formatting of numbers.
* Changed format of arguments to `arg`.
* Added the argument name to most descriptions.
* Placed the closing */ on a separate line, except in one-liner comments.
* Removed reference to Section 9.1.1 for argument conversions.  The spec needs to be
  revised to support this kind of reference tersely.  In particular, we need a paragraph
  describing the rules for determining a common argument and result type, so that text
  does not have to be duplicated many times in the module documentation.
* Formulas were in most cases replaced with text descriptions.  Those remaining are set
  apart from the surrounding text using the :kbd: format specifier.
* Internal reference to functions are formatted with the :proc: cross-reference formatting
  specifier.
* Explicit mention of types and reserved words are formatted using single back-ticks.

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