doc: improve wording of plpgsql RAISE format text
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Discussion:
Backpatch-through: 10
@@ -3623,7 +3623,7 @@ RAISE ;
<para>
After <replaceable class="parameter">level</replaceable> if any,
- you can write a <replaceable class="parameter">format</replaceable>
+ you can specify a <replaceable class="parameter">format</replaceable> string
(which must be a simple string literal, not an expression). The
format string specifies the error message text to be reported.
The format string can be followed
