Update proxying-api-requests-in-development.md

Use pathFilter option to further include/exclude requests which you want to proxy inside the curly braces.

docusaurus/docs/proxying-api-requests-in-development.md

@@ -99,10 +99,10 @@ const { createProxyMiddleware } = require('http-proxy-middleware');
 
 module.exports = function (app) {
   app.use(
-    '/api',
     createProxyMiddleware({
       target: 'http://localhost:5000',
       changeOrigin: true,
+      pathFilter: '/api',
     })
   );
 };