The errhint example wasn't using the mandated style for errhint
which was needlessly confusing. Fix by rewriting it using the
mandated style.
Reported-by: Andres Freund
Reviewed-by: Gurjeet Singh
Reviewed-by: Jonathan S. Katz
Discussion: https://postgr.es/m/
F02F4B4F-7B7E-406A-B25A-
FF2AA300AB9A@yesql.se
Primary: could not create shared memory segment: %m
Detail: Failed syscall was shmget(key=%d, size=%u, 0%o).
-Hint: the addendum
+Hint: The addendum, written as a complete sentence.