docs(cookie): update get method argument description for clarity (#566)

Author: 0x676e67

python/wreq/cookie.py

@@ -119,11 +119,14 @@ def get(self, name: str, url: str) -> Cookie | None:
         r"""
         Look up a cookie by name scoped to the given URL.
 
+        Domain matching is exact: only cookies whose domain exactly matches
+        the URL host are considered. Subdomains are not matched.
+
         Returns `None` if no matching cookie is found.
 
         Args:
             name: The cookie name to look up.
-            url: The URL the cookie is scoped to (used for domain / path matching).
+            url: The URL used for exact domain matching and path matching.
         """
         ...