Fix documentation build errors

sanic/__main__.py

@@ -52,5 +52,5 @@ if __name__ == "__main__":
             "  Example File: project/sanic_server.py -> app\n"
             "  Example Module: project.sanic_server.app".format(e.name)
         )
-    except ValueError as e:
+    except ValueError:
         logger.exception("Failed to run app")

sanic/app.py

@@ -371,8 +371,7 @@ class Sanic:
     ):
         """Decorate a function to be registered as a websocket route
         :param uri: path of the URL
-        :param subprotocols: optional list of strings with the supported
-                             subprotocols
+        :param subprotocols: optional list of str with supported subprotocols
         :param host:
         :return: decorated function
         """
@@ -568,7 +567,7 @@ class Sanic:
         return self.blueprint(*args, **kwargs)
 
     def url_for(self, view_name: str, **kwargs):
-        """Build a URL based on a view name and the values provided.
+        r"""Build a URL based on a view name and the values provided.
 
         In order to build a URL, all request parameters must be supplied as
         keyword arguments, and each parameter must pass the test for the
@@ -579,7 +578,7 @@ class Sanic:
         the output URL's query string.
 
         :param view_name: string referencing the view name
-        :param \*\*kwargs: keys and values that are used to build request
+        :param \**kwargs: keys and values that are used to build request
             parameters and query string arguments.
 
         :return: the built URL

sanic/cookies.py

@@ -18,7 +18,7 @@ _Translator.update({ord('"'): '\\"', ord("\\"): "\\\\"})
 
 
 def _quote(str):
-    """Quote a string for use in a cookie header.
+    r"""Quote a string for use in a cookie header.
     If the string does not need to be double-quoted, then just return the
     string.  Otherwise, surround the string in doublequotes and quote
     (with a \) special characters.

sanic/testing.py

@@ -34,7 +34,7 @@ class SanicTestClient:
             ) as response:
                 try:
                     response.text = await response.text()
-                except UnicodeDecodeError as e:
+                except UnicodeDecodeError:
                     response.text = None
 
                 try: