📝 update documentation

doc/examples/diagnostics_extended.cpp

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+#include <iostream>
+
+# define JSON_DIAGNOSTICS 1
+#include <nlohmann/json.hpp>
+
+using json = nlohmann::json;
+
+int main()
+{
+    json j;
+    j["address"]["street"] = "Fake Street";
+    j["address"]["housenumber"] = "12";
+
+    try
+    {
+        int housenumber = j["address"]["housenumber"];
+    }
+    catch (json::exception& e)
+    {
+        std::cout << e.what() << '\n';
+    }
+}

doc/examples/diagnostics_extended.link

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+<a target="_blank" href="https://wandbox.org/permlink/pbz3ULoJ4maRnV8N"><b>online</b></a>

doc/examples/diagnostics_extended.output

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+[json.exception.type_error.302] (/address/housenumber) type must be number, but is string

doc/examples/diagnostics_standard.cpp

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+#include <iostream>
+#include <nlohmann/json.hpp>
+
+using json = nlohmann::json;
+
+int main()
+{
+    json j;
+    j["address"]["street"] = "Fake Street";
+    j["address"]["housenumber"] = "12";
+
+    try
+    {
+        int housenumber = j["address"]["housenumber"];
+    }
+    catch (json::exception& e)
+    {
+        std::cout << e.what() << '\n';
+    }
+}

doc/examples/diagnostics_standard.link

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+<a target="_blank" href="https://wandbox.org/permlink/fWfQhHzG03P6PAcC"><b>online</b></a>

doc/examples/diagnostics_standard.output

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+[json.exception.type_error.302] type must be number, but is string