[Ada] Change parameterized expression to expression function

[Arnaud Charlet <charlet at adacore dot com>]

This is simply a terminology change reflecting latest ARG thinking.
Mostly it is a matter of internal documentation and names of internal
entities, but it does affect error messages as shown by the following
test:

     1. pragma Ada_2012;
     2. package exprfunc is
     3.    function F return integer is 3;
                                        |
        >>> expression function must be enclosed in parentheses

     4. end;

Tested on x86_64-pc-linux-gnu, committed on trunk

2011-08-02  Robert Dewar  <dewar@adacore.com>

	* exp_util.adb, par-ch10.adb, par-ch6.adb, sem.adb, sem_ch6.adb,
	sem_ch6.ads, sinfo.adb, sinfo.ads, sprint.adb: Change parameterized
	expression to expression function.

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