[issue8824] Improve documentation of exec

[Jordan Stadler]

Jordan Stadler <jordan.stadler at gmail.com> added the comment:

Patches for 2.x and 3.x documentation related to 'exec'.

2.x
  Provides more information about scopes when using additional expressions
  for 'exec'. 2.x documentation for 'exec' is found in
  reference/simple_stmts.
3.x
  Provides more information about scopes when using additional expressions
  for 'exec'.  3.x documentation for 'exec' is found in library/functions.

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