docs: add missing 'that' in comment

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---

Author: Planeshifter

lib/node_modules/@stdlib/math/tools/unary/README.md

@@ -317,7 +317,7 @@ var policies = {
     'casting': 'none'
 };
 
-// Create a function performs element-wise computation:
+// Create a function that performs element-wise computation:
 var abs = ufunc( dispatcher, [ idt ], odt, policies );
 
 // Generate an array of random numbers: