Update link in static files

Author: rpanackal

sample-code/spring-app/src/main/resources/static/index.html

@@ -637,9 +637,9 @@ <h5 class="mb-1">OpenAI</h5>
                         <ul class="list-group">
                             <li class="list-group-item">
                                 <div class="info-tooltip">
-                                    <button type="submit" formaction="/spring-ai-openai/embed"
+                                    <button type="submit" formaction="/spring-ai-openai/embed/strings"
                                             class="link-offset-2-hover link-underline link-underline-opacity-0 link-underline-opacity-75-hover endpoint">
-                                        <code>/spring-ai-openai/embed</code>
+                                        <code>/spring-ai-openai/embed/strings</code>
                                     </button>
                                     <div class="tooltip-content">
                                         Get the embedding for a given string using SpringAI from OpenAI.