style: fix missing space

Signed-off-by: Athan <kgryte@gmail.com>

Author: kgryte

lib/node_modules/@stdlib/blas/ext/base/ndarray/gsumpw/README.md

@@ -33,7 +33,7 @@ limitations under the License.
 ## Usage
 
 ```javascript
-var gsumpw= require( '@stdlib/blas/ext/base/ndarray/gsumpw' );
+var gsumpw = require( '@stdlib/blas/ext/base/ndarray/gsumpw' );
 ```
 
 #### gsumpw( arrays )