pgsql: Tweak wording of syntax error messages about bad CONTINUE/EXIT s

Tweak wording of syntax error messages about bad CONTINUE/EXIT statements.

Try to avoid any possible confusion about what these messages mean.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/18391a8f0649f40bb841e6492895551fd873f79b

Modified Files
--------------
src/pl/plpgsql/src/pl_gram.y | 10 +++++-----
src/test/regress/expected/plpgsql.out | 8 ++++----
src/test/regress/sql/plpgsql.sql | 2 +-
3 files changed, 10 insertions(+), 10 deletions(-)

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