added path parameters examples to URL BUILDING section

docs/Reference/Routes.md

@@ -227,8 +227,23 @@ checked before parametric and wildcard.*
 
 ```js
 // parametric
-fastify.get('/example/:userId', (request, reply) => {})
-fastify.get('/example/:userId/:secretToken', (request, reply) => {})
+fastify.get('/example/:userId', (request, reply) => {
+    /**
+     * curl ${app-url}/example/12345
+     * userId === '12345'
+     */
+    const { userId } = request.params;
+    /* your code here */
+})
+fastify.get('/example/:userId/:secretToken', (request, reply) => {
+  /**
+   * curl ${app-url}/example/12345/abc.zHi
+   * userId === '12345'
+   * secretToken === 'abc.zHi'
+   */
+  const { userId, secretToken } = request.params;
+  /* your code here */
+})
 
 // wildcard
 fastify.get('/example/*', (request, reply) => {})
@@ -237,19 +252,43 @@ fastify.get('/example/*', (request, reply) => {})
 Regular expression routes are supported as well, but be aware that you have to escape slashes. Take note that RegExp is also very expensive in terms of performance!
 ```js
 // parametric with regexp
-fastify.get('/example/:file(^\\d+).png', (request, reply) => {})
+fastify.get('/example/:file(^\\d+).png', (request, reply) => {
+  /**
+   * curl ${app-url}/example/12345.png
+   * file === '12345'
+   */
+  const { file } = request.params;
+  /* your code here */
+})
 ```
 
 It is possible to define more than one parameter within the same couple of slash
 ("/"). Such as:
 ```js
-fastify.get('/example/near/:lat-:lng/radius/:r', (request, reply) => {})
+fastify.get('/example/near/:lat-:lng/radius/:r', (request, reply) => {
+  /**
+   * curl ${app-url}/example/near/15°N-30°E/radius/20
+   * lat === "15°N"
+   * lng === "30°E"
+   * r ==="20"
+   */
+  const { lat, lng, r } = request.params;
+  /* your code here */
+})
 ```
 *Remember in this case to use the dash ("-") as parameters separator.*
 
 Finally, it is possible to have multiple parameters with RegExp:
 ```js
-fastify.get('/example/at/:hour(^\\d{2})h:minute(^\\d{2})m', (request, reply) => {})
+fastify.get('/example/at/:hour(^\\d{2})h:minute(^\\d{2})m', (request, reply) => {
+  /**
+   * curl ${app-url}/example/at/08h24m
+   * hour === "08"
+   * minute === "24"
+   */
+  const { hour, minute } = request.params;
+  /* your code here */
+})
 ```
 In this case as parameter separator it is possible to use whatever character is
 not matched by the regular expression.