Fix example

Author: kgryte

lib/node_modules/@stdlib/ndarray/base/dtype2c/README.md

@@ -55,7 +55,7 @@ out = dtype2c( 'int8' );
 If provided an unknown or unsupported data type, the function returns `null`.
 
 ```javascript
-var out = dtypeChar( 'foobar' );
+var out = dtype2c( 'foobar' );
 // returns null
 ```