docs: fix grammar

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---

Author: kgryte

lib/node_modules/@stdlib/ndarray/every/docs/types/test.ts

@@ -25,7 +25,7 @@ import every = require( './index' );
 
 // TESTS //
 
-// The function returns an boolean ndarray...
+// The function returns a boolean ndarray...
 {
 	const x = zeros( [ 2, 2 ] );