docs: fix variable name

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Author: kgryte

lib/node_modules/@stdlib/object/assign-in/README.md

@@ -89,7 +89,7 @@ var bool = ( z === x );
 <!-- eslint no-undef: "error" -->
 
 ```javascript
-var assign = require( '@stdlib/object/assign-in' );
+var assignIn = require( '@stdlib/object/assign-in' );
 
 function Foo() {
     this.a = 1;