docs: update description

Signed-off-by: Athan <[email protected]>

Author: kgryte

lib/node_modules/@stdlib/math/base/special/roundsd/README.md

@@ -32,7 +32,7 @@ var roundsd = require( '@stdlib/math/base/special/roundsd' );
 
 #### roundsd( x, n\[, b] )
 
-Rounds a `numeric` value to the nearest `number` with `n` significant figures.
+Rounds a double-precision floating-point number to the nearest value with `n` significant figures.
 
 ```javascript
 var v = roundsd( 3.141592653589793, 3 );