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

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 18391a8f0649f40bb841e6492895551fd873f79b
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2015-08-23T21:34:47Z
Releases: 9.6.0
Tweak wording of syntax error messages about bad CONTINUE/EXIT statements.

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

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