Log Message:
-----------
Improve documentation of configure's readline/libedit switches.

Modified Files:
--------------
    pgsql:
        configure (r1.506 -> r1.507)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/configure.diff?r1=1.506&r2=1.507)
        configure.in (r1.476 -> r1.477)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/configure.in.diff?r1=1.476&r2=1.477)
    pgsql/doc/src/sgml:
        installation.sgml (r1.262 -> r1.263)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/installation.sgml.diff?r1=1.262&r2=1.263)

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