Fix 5.x docs drift from 4.x conventions (part of gh-1881)

- res.type() example had a stray trailing colon and missing quotes
  (image/png: -> 'image/png'), matching every sibling example in that
  block and the 4.x doc.
- Reordered req.host/req.hostname to match 4.x's order (hostname then
  host); only moved the blocks, didn't touch their content.
- Frontmatter description wording changed from "The request/response
  object..." to "The req/res object..." to match 4.x.

Author: salashivam2-eng

src/content/api/5x/api/request/index.mdx

@@ -1,6 +1,6 @@
 ---
 title: Request Object
-description: The request object represents the HTTP request and has properties for the request query string, parameters, body, HTTP headers, and so on
+description: The req object represents the HTTP request and has properties for the request query string, parameters, body, HTTP headers, and so on
 ---
 
 import Alert from '@components/primitives/Alert/Alert.astro';
@@ -234,13 +234,13 @@ console.dir(req.fresh);
 // => true
 ```
 
-### req.host
+### req.hostname
 
 <Signature type="String" />
 
-Contains the host derived from the `Host` HTTP header.
+Contains the hostname derived from the `Host` HTTP header.
 
-When the [`trust proxy` setting](/api/application/#application-settings)
+When the [`trust proxy` setting](/api/application/#options-for-trust-proxy-setting)
 does not evaluate to `false`, this property will instead get the value
 from the `X-Forwarded-Host` header field. This header can be set by
 the client or by the proxy.
@@ -251,21 +251,17 @@ comma-separated values, in which the first value is used.
 
 ```js
 // Host: "example.com:3000"
-console.dir(req.host);
-// => 'example.com:3000'
-
-// Host: "[::1]:3000"
-console.dir(req.host);
-// => '[::1]:3000'
+console.dir(req.hostname);
+// => 'example.com'
 ```
 
-### req.hostname
+### req.host
 
 <Signature type="String" />
 
-Contains the hostname derived from the `Host` HTTP header.
+Contains the host derived from the `Host` HTTP header.
 
-When the [`trust proxy` setting](/api/application/#options-for-trust-proxy-setting)
+When the [`trust proxy` setting](/api/application/#application-settings)
 does not evaluate to `false`, this property will instead get the value
 from the `X-Forwarded-Host` header field. This header can be set by
 the client or by the proxy.
@@ -276,8 +272,12 @@ comma-separated values, in which the first value is used.
 
 ```js
 // Host: "example.com:3000"
-console.dir(req.hostname);
-// => 'example.com'
+console.dir(req.host);
+// => 'example.com:3000'
+
+// Host: "[::1]:3000"
+console.dir(req.host);
+// => '[::1]:3000'
 ```
 
 ### req.ip

src/content/api/5x/api/response/index.mdx

@@ -1,6 +1,6 @@
 ---
 title: Response
-description: The response object represents the HTTP response that an Express app sends when it gets an HTTP request.
+description: The res object represents the HTTP response that an Express app sends when it gets an HTTP request.
 ---
 
 import Alert from '@components/primitives/Alert/Alert.astro';
@@ -1104,7 +1104,7 @@ res.type('.html'); // => 'text/html'
 res.type('html'); // => 'text/html'
 res.type('json'); // => 'application/json'
 res.type('application/json'); // => 'application/json'
-res.type('png'); // => image/png:
+res.type('png'); // => 'image/png'
 ```
 
 Aliased as `res.contentType(type)`.