docs: gh feedback link (#21606)

Co-authored-by: bracesproul <braceasproul@gmail.com>

docs/src/theme/Feedback.js

@@ -112,6 +112,7 @@ export default function Feedback() {
   const { setCookie, checkCookie } = useCookie();
   const [feedbackSent, setFeedbackSent] = useState(false);
   const { siteConfig } = useDocusaurusContext();
+  const [pathname, setPathname] = useState("");
 
   /** @param {"good" | "bad"} feedback */
   const handleFeedback = async (feedback) => {
@@ -167,6 +168,7 @@ export default function Feedback() {
       // (cookies exp in 24hrs)
       const cookieName = `${FEEDBACK_COOKIE_PREFIX}_${window.location.pathname}`;
       setFeedbackSent(checkCookie(cookieName));
+      setPathname(window.location.pathname);
     }
   }, []);
 
@@ -192,6 +194,10 @@ export default function Feedback() {
     onMouseUp: (e) => (e.currentTarget.style.backgroundColor = "#f0f0f0"),
   };
 
+  const newGithubIssueURL = pathname
+    ? `https://github.com/langchain-ai/langchain/issues/new?assignees=&labels=03+-+Documentation&projects=&template=documentation.yml&title=DOC%3A+%3CIssue+related+to+${pathname}%3E`
+    : "https://github.com/langchain-ai/langchain/issues/new?assignees=&labels=03+-+Documentation&projects=&template=documentation.yml&title=DOC%3A+%3CPlease+write+a+comprehensive+title+after+the+%27DOC%3A+%27+prefix%3E";
+
   return (
     <div style={{ display: "flex", flexDirection: "column" }}>
       <hr />
@@ -199,7 +205,7 @@ export default function Feedback() {
         <h4>Thanks for your feedback!</h4>
       ) : (
         <>
-          <h4>Help us out by providing feedback on this documentation page:</h4>
+          <h4>Was this page helpful?</h4>
           <div style={{ display: "flex", gap: "5px" }}>
             <div
               {...defaultFields}
@@ -240,6 +246,14 @@ export default function Feedback() {
           </div>
         </>
       )}
+      <br />
+      <h4>
+        You can leave detailed feedback{" "}
+        <a target="_blank" href={newGithubIssueURL}>
+          on GitHub
+        </a>
+        .
+      </h4>
     </div>
   );
 }