docs: refactor readme

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---

Author: headlessNode

lib/node_modules/@stdlib/array/base/linspace2d/README.md

@@ -42,6 +42,13 @@ x = linspace2d( 0, 100, [ 2, 3 ], true );
 // returns [ [ 0, 40, 80 ], [ 20, 60, 100 ] ]
 ```
 
+The function accepts the following arguments:
+
+-   **start**: First array value.
+-   **stop**: Last array value.
+-   **shape**: Array shape.
+-   **colexicographic**: Specifies whether generated array values should be stored in colexicographic order.
+
 </section>
 
 <!-- /.usage -->
@@ -63,19 +70,19 @@ x = linspace2d( 0, 100, [ 2, 3 ], true );
 
     ```javascript
     var roundn = require( '@stdlib/math/base/special/roundn' );
+    var map2d = require( '@stdlib/array/base/map2d' );
 
     // Create an array subject to floating-point rounding errors:
-    var arr = linspace( 0, 10, [ 3, 3 ], false );
-
-    // Round each value to the nearest hundredth:
-    var i;
-    var j;
-    for ( i = 0; i < arr.length; i++ ) {
-        for ( j = 0; j < arr[i].length; j++ ) {
-            arr[ i ][ j ] = roundn( arr[ i ][ j ], -2 );
-        }
+    var arr = linspace2d( 0, 11, [ 3, 3 ], false );
+    // returns [ [ 0, 1.375, 2.75 ], [ 4.125, 5.5, 6.875 ], [ 8.25, 9.625, 11 ] ]
+
+    // Round each value to the nearest tenth:
+    var out = map2d( arr, [ 3, 3 ], clbk );
+    // returns [ [ 0, 1.4, 2.8 ], [ 4.1, 5.5, 6.9 ], [ 8.3, 9.6, 11 ] ]
+
+    function clbk( v ) {
+        return roundn( v, -1 );
     }
-    console.log( arr.join( '\n' ) );
     ```
 
 </section>