[DOCS] Slight discrepancy

[Lyle]

Here:
http://www.postgresql.org/docs/9.2/static/datatype-numeric.html
smallint        2 bytes         small-range integer     -32768 to +32767
integer         4 bytes         typical choice for integer      -2147483648 to 
+2147483647
bigint 	8 bytes 	large-range integer 	-9223372036854775808 to 
9223372036854775807


The bigint maximum positive number doesn't have the + prefix like the 
others.


Lyle