docs: resolve local links script escape (#21840)

Fixing warnings. Needs to be propagated to 0.1 branch if this works.

![Screenshot 2024-05-17 at 2 34
15 PM](https://github.com/langchain-ai/langchain/assets/9557659/e6ac95a9-5686-4747-9ab8-4cb49942dc8d)

docs/scripts/copy_templates.py

@@ -21,7 +21,7 @@ if __name__ == "__main__":
         with open(full_destination, "r") as f:
             content = f.read()
         # remove images
-        content = re.sub("\!\[.*?\]\((.*?)\)", "", content)
+        content = re.sub(r"\!\[.*?\]\((.*?)\)", "", content)
         with open(full_destination, "w") as f:
             f.write(content)
 
@@ -39,7 +39,7 @@ sidebar_class_name: hidden
         content = f.read()
 
     # replace relative links
-    content = re.sub("\]\(\.\.\/", "](/docs/templates/", content)
+    content = re.sub(r"\]\(\.\.\/", "](/docs/templates/", content)
 
     with open(templates_index_intermediate, "w") as f:
         f.write(sidebar_hidden + content)

docs/scripts/resolve_local_links.py

@@ -11,7 +11,7 @@ def update_links(doc_path, docs_link):
         content = f.read()
 
     # replace relative links
-    content = re.sub("\]\(\.\/", f"]({docs_link}", content)
+    content = re.sub(r"\]\(\.\/", f"]({docs_link}", content)
 
     with open(DOCS_DIR / doc_path, "w") as f:
         f.write(content)