Updated OllamaFunctionTool.toString to reflect what the Ollama API actually wants

Added @NotNull annotation to OllamaFunctionTool.name and OllamaFunctionTool.parameters since the documentation reports as these being required

Made sure that OllamaFunctionTool.description is actually optional as the Ollama API docs define

WikipediaTool/src/main/java/me/zacharias/neuro/dock/wikipedia/GetWikiPageText.java

@@ -5,12 +5,13 @@ import me.zacharias.chat.ollama.OllamaFunctionArgument;
 import me.zacharias.chat.ollama.OllamaFunctionTool;
 import me.zacharias.chat.ollama.OllamaPerameter;
 import me.zacharias.chat.ollama.OllamaToolRespnce;
+import org.jetbrains.annotations.NotNull;
 
 public class GetWikiPageText extends OllamaFunctionTool {
     Wiki wiki = WikipediaTool.wiki;
 
     @Override
-    public String name() {
+    public @NotNull String name() {
         return "get_wiki_page_text";
     }
 
@@ -20,7 +21,7 @@ public class GetWikiPageText extends OllamaFunctionTool {
     }
 
     @Override
-    public OllamaPerameter parameters() {
+    public @NotNull OllamaPerameter parameters() {
         return OllamaPerameter.builder()
                 .addProperty("title", OllamaPerameter.OllamaPerameterBuilder.Type.STRING, "The title of the Wikipedia page to retrieve text from.", true)
                 .build();