docs: fix comments

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---

Author: kgryte

lib/node_modules/@stdlib/math/tools/unary/examples/assign.js

@@ -54,7 +54,7 @@ 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:

lib/node_modules/@stdlib/math/tools/unary/examples/index.js

@@ -51,7 +51,7 @@ 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: