docs: fix comments and returns description

lib/node_modules/@stdlib/complex/float64/base/add3/docs/types/test.ts

@@ -185,7 +185,7 @@ import add3 = require( './index' );
 	add3.assign( 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, ( x: number ): number => x, 1, 0 ); // $ExpectError
 }
 
-// The compiler throws an error if the `assign` method is provided a sixth argument which is not a number...
+// The compiler throws an error if the `assign` method is provided an eighth argument which is not a number...
 {
 	const out = new Float64Array( 2 );
 
@@ -199,7 +199,7 @@ import add3 = require( './index' );
 	add3.assign( 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, out, ( x: number ): number => x, 0 ); // $ExpectError
 }
 
-// The compiler throws an error if the `assign` method is provided a seventh argument which is not a number...
+// The compiler throws an error if the `assign` method is provided a ninth argument which is not a number...
 {
 	const out = new Float64Array( 2 );
 

lib/node_modules/@stdlib/stats/strided/nanrange/lib/main.js

@@ -32,7 +32,7 @@ var ndarray = require( './ndarray.js' );
 * @param {PositiveInteger} N - number of indexed elements
 * @param {NumericArray} x - input array
 * @param {integer} strideX - stride length
-* @returns {number} variance
+* @returns {number} range
 *
 * @example
 * var x = [ 1.0, -2.0, NaN, 2.0 ];