test: update description

Signed-off-by: Philipp Burckhardt <pburckhardt@outlook.com>

Author: Planeshifter

lib/node_modules/@stdlib/stats/incr/nanmmape/test/test.js

@@ -138,7 +138,7 @@ tape( 'if data has yet to be provided, the accumulator function returns `null`',
 	t.end();
 });
 
-tape( 'if provided `NaN`, the accumulated function ignore it (returns the current mean absolute percentage error)', function test( t ) {
+tape( 'if provided `NaN`, the accumulator function ignores it (returns the current mean absolute percentage error)', function test( t ) {
 	var expected;
 	var data;
 	var acc;