docs: fix URL docstring typos

Author: codex

httpcore/_models.py

@@ -183,13 +183,13 @@ class URL:
     """
     Represents the URL against which an HTTP request may be made.
 
-    The URL may either be specified as a plain string, for convienence:
+    The URL may either be specified as a plain string, for convenience:
 
     ```python
     url = httpcore.URL("https://www.example.com/")
     ```
 
-    Or be constructed with explicitily pre-parsed components:
+    Or be constructed with explicitly pre-parsed components:
 
     ```python
     url = httpcore.URL(scheme=b'https', host=b'www.example.com', port=None, target=b'/')