Transpose info from src/pl/plpgsql/test/README into standard regression test file.

src/test/regress/expected/plpgsql.out

 --
 -- PLPGSQL
 --
+-- Scenario:
+-- 
+--     A building with a modern TP cable installation where any
+--     of the wall connectors can be used to plug in phones,
+--     ethernet interfaces or local office hubs. The backside
+--     of the wall connectors is wired to one of several patch-
+--     fields in the building.
+-- 
+--     In the patchfields, there are hubs and all the slots
+--     representing the wall connectors. In addition there are
+--     slots that can represent a phone line from the central
+--     phone system.
+-- 
+--     Triggers ensure consistency of the patching information.
+-- 
+--     Functions are used to build up powerful views that let
+--     you look behind the wall when looking at a patchfield
+--     or into a room.
+-- 
 create table Room (
     roomno	char(8),
     comment	text

src/test/regress/sql/plpgsql.sql

 --
 -- PLPGSQL
 --
+-- Scenario:
+-- 
+--     A building with a modern TP cable installation where any
+--     of the wall connectors can be used to plug in phones,
+--     ethernet interfaces or local office hubs. The backside
+--     of the wall connectors is wired to one of several patch-
+--     fields in the building.
+-- 
+--     In the patchfields, there are hubs and all the slots
+--     representing the wall connectors. In addition there are
+--     slots that can represent a phone line from the central
+--     phone system.
+-- 
+--     Triggers ensure consistency of the patching information.
+-- 
+--     Functions are used to build up powerful views that let
+--     you look behind the wall when looking at a patchfield
+--     or into a room.
+-- 
+
 
 create table Room (
     roomno	char(8),