Properly capitalize hyphenated words in documentation titles.

doc/src/sgml/backup.sgml

doc/src/sgml/biblio.sgml

doc/src/sgml/client-auth.sgml

doc/src/sgml/config.sgml

doc/src/sgml/dfunc.sgml

doc/src/sgml/earthdistance.sgml

doc/src/sgml/ecpg.sgml

doc/src/sgml/func.sgml

doc/src/sgml/installation.sgml

doc/src/sgml/lobj.sgml

doc/src/sgml/mvcc.sgml

doc/src/sgml/nls.sgml

doc/src/sgml/plpgsql.sgml

doc/src/sgml/plpython.sgml

doc/src/sgml/protocol.sgml

doc/src/sgml/ref/create_table.sgml

doc/src/sgml/release-9.1.sgml

doc/src/sgml/runtime.sgml

doc/src/sgml/syntax.sgml

doc/src/sgml/xaggr.sgml