test: use standard deviation instead of stdev

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---

Author: Planeshifter

lib/node_modules/@stdlib/stats/base/dists/cosine/stdev/test/test.native.js

@@ -86,7 +86,7 @@ tape( 'if provided a nonpositive `s`, the function returns `NaN`', opts, functio
 	t.end();
 });
 
-tape( 'the function returns the stdev of a raised cosine distribution', opts, function test( t ) {
+tape( 'the function returns the standard deviation of a raised cosine distribution', opts, function test( t ) {
 	var expected;
 	var delta;
 	var tol;