Log Message:
-----------
Minor editorial improvements to txid functions' documentation: put back
some text that got dropped, improve markup, improve descriptions of
snapshot components.

Modified Files:
--------------
    pgsql/doc/src/sgml:
        func.sgml (r1.409 -> r1.410)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/func.sgml?r1=1.409&r2=1.410)

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