Spell checking and markup additions

doc/src/sgml/bki.sgml

doc/src/sgml/catalogs.sgml

doc/src/sgml/charset.sgml

doc/src/sgml/client-auth.sgml

doc/src/sgml/datatype.sgml

doc/src/sgml/datetime.sgml

doc/src/sgml/docguide.sgml

doc/src/sgml/func.sgml

doc/src/sgml/indexcost.sgml

doc/src/sgml/jdbc.sgml

doc/src/sgml/libpgtcl.sgml

doc/src/sgml/libpq++.sgml

doc/src/sgml/libpq.sgml

doc/src/sgml/monitoring.sgml

doc/src/sgml/nls.sgml

doc/src/sgml/odbc.sgml

doc/src/sgml/perform.sgml

doc/src/sgml/plpython.sgml

doc/src/sgml/plsql.sgml

doc/src/sgml/pltcl.sgml