Doc: explain that the string types can't store \0 (ASCII NUL).

This restriction was mentioned in connection with string literals,
but it wasn't made clear that it's a general restriction not just
a syntactic limitation in query strings.

Per unsigned documentation comment.

Discussion: 
https://postgr.es/m/[email protected]

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/9a2641911aeaa7f6523dc2a465088051d4c85901

Modified Files
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doc/src/sgml/datatype.sgml | 13 +++++++++----
1 file changed, 9 insertions(+), 4 deletions(-)

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