Docs: increase max of extra_float_digits to 3
<body>
<p>Adjusts the number of digits displayed for floating-point values, including float4, float8,
and geometric data types. The parameter value is added to the standard number of digits. The
- value can be set as high as 2, to include partially-significant digits; this is especially
+ value can be set as high as 3, to include partially-significant digits; this is especially
useful for dumping float data that needs to be restored exactly. Or it can be set negative
to suppress unwanted digits. </p>
<table id="extra_float_digits_table">
