Update documentation

Author: tharun571

docs/source/magics.rst

@@ -28,6 +28,12 @@ Leverage the large language models to assist in your development process. Curren
     %%xassist model
     prompt
 
+- Reset model and clear chat history
+
+.. code::
+
+    %%xassist model --refresh
+
 - Example
 
 .. image:: gemini.png

src/xmagics/xassist.cpp

@@ -100,11 +100,11 @@ namespace xcpp
 
             if(model == "gemini")
             {
-                out << "{ \"role\": \"" << user << "\", \"parts\": [ { \"text\": " << serializedCell << "}]}\n";
+                out << "{ \"role\": \"" << user << R"(", "parts": [ { "text": )" << serializedCell << "}]}\n";
             }
             else
             {
-                out << "{ \"role\": \"" << user << "\", \"content\": " << serializedCell << "}\n";
+                out << "{ \"role\": \"" << user << R"(", "content": )" << serializedCell << "}\n";
             }
 
             out.close();
@@ -275,7 +275,8 @@ namespace xcpp
                 xcpp::APIKeyManager::saveApiKey(model, cell);
                 return;
             } 
-            else if (tokens[2] == "--refresh")
+            
+            if (tokens[2] == "--refresh")
             {
                 xcpp::ChatHistory::refresh(model);
                 return;