doc/postgresql-test-hook: Add example

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doc
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doc/hooks/postgresql-test-hook.section.md
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Bash-only variables:
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- `postgresqlTestUserOptions`: SQL options to use when creating the `$PGUSER` role, default: `LOGIN`.
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- `postgresqlTestUserOptions`: SQL options to use when creating the `$PGUSER` role, default: `"LOGIN"`. Example: `"LOGIN SUPERUSER"`
- `postgresqlTestSetupSQL`: SQL commands to run as database administrator after startup, default: statements that create `$PGUSER` and `$PGDATABASE`.
- `postgresqlTestSetupCommands`: bash commands to run after database start, defaults to running `$postgresqlTestSetupSQL` as database administrator.
- `postgresqlEnableTCP`: set to `1` to enable TCP listening. Flaky; not recommended.