docs:  improve 'capitals' inheritance example

Adds constraints and improves wording.

Reported-by: [email protected]

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

Backpatch-through: 9.5

Branch
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REL_11_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/104a7dad363d9c3cff89c068ceadf2f1e5a9c8b9

Modified Files
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doc/src/sgml/advanced.sgml | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)

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