docs: improved docs

docs/examples/_shared_requests.md

@@ -0,0 +1,3 @@
+```http #sharedGetRequest
+GET https://httpbin.org/get
+```

docs/examples/with-shared-requests.md

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+# Main Document
+
+Let's include some shared requests:
+
+::md[./_shared_requests.md]
+
+The shared GET request returned: {{response.statusText}}
+
+Now, a request specific to this document:
+
+```http
+POST https://httpbin.org/post
+Content-Type: application/json
+
+{"dataFromMain": "someValue", "sharedUrl": "{{requests.sharedGetRequest.url}}"}
+```
+
+::response