docs: update notes section

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Author: anandkaranubc

lib/node_modules/@stdlib/math/base/special/sinpi/lib/main.js

@@ -36,10 +36,7 @@ var PI = require( '@stdlib/constants/float64/pi' );
 *
 * ## Notes
 *
-* -   `sin(-x) = -sin(x)`
-* -   `sin(+n) = +0`, where `n` is a positive integer
-* -   `sin(-n) = -sin(+n) = -0`, where `n` is a positive integer
-* -   `cos(-x) = cos(x)`
+* -   The function computes `sin(πx)` more accurately than the obvious approach, especially for large `x`.
 *
 * @param {number} x - input value
 * @returns {number} function value