Apply suggestions from code review

Signed-off-by: Athan <kgryte@gmail.com>

Author: kgryte

lib/node_modules/@stdlib/stats/mean/docs/types/index.d.ts

@@ -116,7 +116,7 @@ interface Unary {
 * var x = array( [ 1.0, 2.0, -2.0, 4.0 ] );
 *
 * var y = mean( x );
-* // returns <ndarray>[ 1.25]
+* // returns <ndarray>[ 1.25 ]
 *
 * @example
 * var array = require( '@stdlib/ndarray/array' );

lib/node_modules/@stdlib/stats/mean/lib/index.js

@@ -45,7 +45,7 @@
 *
 * // Perform reduction:
 * var out = mean( x );
-* // returns <ndarray>[ 6.5]
+* // returns <ndarray>[ 6.5 ]
 */
 
 // MODULES //

lib/node_modules/@stdlib/stats/mean/lib/main.js

@@ -88,7 +88,7 @@ var table = {
 *
 * // Perform reduction:
 * var out = mean( x );
-* // returns <ndarray>[ 6.5]
+* // returns <ndarray>[ 6.5 ]
 */
 var mean = factory( table, [ idtypes ], odtypes, policies );