Remove trailing whitespace

Author: kgryte

lib/node_modules/@stdlib/utils/group/README.md

@@ -44,7 +44,7 @@ var arr = [ 'beep', 'boop', 'foo', 'bar' ];
 var groups = [ 'b', 'b', 'f', 'b' ];
 
 var opts = {
-    'returns': 'indices'  
+    'returns': 'indices'
 };
 var out = group( arr, opts, groups );
 // returns { 'b': [ 0, 1, 3 ], 'f': [ 2 ] }
@@ -57,7 +57,7 @@ var arr = [ 'beep', 'boop', 'foo', 'bar' ];
 var groups = [ 'b', 'b', 'f', 'b' ];
 
 var opts = {
-    'returns': '*'  
+    'returns': '*'
 };
 var out = group( arr, opts, groups );
 // returns { 'b': [ [ 0, 'beep' ], [ 1, 'boop ], [ 3, 'bar' ] ], 'f': [ [ 2, 'foo' ] ] }