[DOCS] Underscorces in copy-documentation (9.0 and higher)

[Mario Duhanic]

Hi,


   - http://www.postgresql.org/docs/9.2/static/sql-copy.html,
   - http://www.postgresql.org/docs/9.1/static/sql-copy.html and
   - http://www.postgresql.org/docs/9.0/static/sql-copy.html

have underscores ("_") where there should be none,
e.g. in "FORCE_QUOTES".

Best regards,