Fix variable name

Author: kgryte

lib/node_modules/@stdlib/math/strided/special/abs2/README.md

@@ -33,7 +33,7 @@ limitations under the License.
 ## Usage
 
 ```javascript
-var abs = require( '@stdlib/math/strided/special/abs2' );
+var abs2 = require( '@stdlib/math/strided/special/abs2' );
 ```
 
 #### abs2( N, x, strideX, y, strideY )