Обсуждение: pgsql: Add a few more details in the source-code-formatting

Log Message:
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Add a few more details in the source-code-formatting documentation.
This isn't exhaustive but it covers some of the more common layout
mistakes I've seen in submitted patches.

Modified Files:
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    pgsql/doc/src/sgml:
        sources.sgml (r2.30 -> r2.31)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/sources.sgml?r1=2.30&r2=2.31)