Add assorted annotations (#3335)

* Add assorted annotations

* Fix type of Purpose items

stdlib/2and3/ssl.pyi

@@ -181,8 +181,8 @@ if sys.version_info < (3,):
 else:
     class _ASN1Object(NamedTuple('_ASN1Object', [('nid', int), ('shortname', str), ('longname', str), ('oid', str)])): ...
     class Purpose(_ASN1Object, enum.Enum):
-        SERVER_AUTH = ...
-        CLIENT_AUTH = ...
+        SERVER_AUTH: _ASN1Object
+        CLIENT_AUTH: _ASN1Object
 
 class SSLSocket(socket.socket):
     context: SSLContext
@@ -208,17 +208,15 @@ class SSLSocket(socket.socket):
     def version(self) -> Optional[str]: ...
     def pending(self) -> int: ...
 
-
 if sys.version_info >= (3, 7):
     class TLSVersion(enum.IntEnum):
-        MINIMUM_SUPPORTED = ...
-        MAXIMUM_SUPPORTED = ...
-        SSLv3 = ...
-        TLSv1 = ...
-        TLSv1_1 = ...
-        TLSv1_2 = ...
-        TLSv1_3 = ...
-
+        MINIMUM_SUPPORTED: int
+        MAXIMUM_SUPPORTED: int
+        SSLv3: int
+        TLSv1: int
+        TLSv1_1: int
+        TLSv1_2: int
+        TLSv1_3: int
 
 class SSLContext:
     check_hostname: bool

stdlib/3/http/client.pyi

@@ -112,14 +112,18 @@ class HTTPResponse(io.BufferedIOBase, BinaryIO):
 # urllib.request uses it for a parameter.
 class _HTTPConnectionProtocol(Protocol):
     if sys.version_info >= (3, 7):
-        def __call__(self, host: str, port: Optional[int] = ...,
-                     timeout: float = ...,
-                     source_address: Optional[Tuple[str, int]] = ...,
-                     blocksize: int = ...): ...
+        def __call__(
+            self,
+            host: str,
+            port: Optional[int] = ...,
+            timeout: float = ...,
+            source_address: Optional[Tuple[str, int]] = ...,
+            blocksize: int = ...,
+        ) -> HTTPConnection: ...
     else:
-        def __call__(self, host: str, port: Optional[int] = ...,
-                     timeout: float = ...,
-                     source_address: Optional[Tuple[str, int]] = ...): ...
+        def __call__(
+            self, host: str, port: Optional[int] = ..., timeout: float = ..., source_address: Optional[Tuple[str, int]] = ...,
+        ) -> HTTPConnection: ...
 
 class HTTPConnection:
     timeout: float