Add missing annotations for xml.dom.minidom.DOMImplementation (#8556)

Co-authored-by: Alex Waygood <[email protected]>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: 3 people

stdlib/xml/dom/minidom.pyi

@@ -265,10 +265,10 @@ class Notation(Identified, Childless, Node):
     def __init__(self, name, publicId, systemId) -> None: ...
 
 class DOMImplementation(DOMImplementationLS):
-    def hasFeature(self, feature, version) -> bool: ...
-    def createDocument(self, namespaceURI: str | None, qualifiedName: str | None, doctype): ...
-    def createDocumentType(self, qualifiedName: str | None, publicId, systemId): ...
-    def getInterface(self, feature): ...
+    def hasFeature(self, feature: str, version: str | None) -> bool: ...
+    def createDocument(self, namespaceURI: str | None, qualifiedName: str | None, doctype: DocumentType | None) -> Document: ...
+    def createDocumentType(self, qualifiedName: str | None, publicId: str, systemId: str) -> DocumentType: ...
+    def getInterface(self: Self, feature: str) -> Self | None: ...
 
 class ElementInfo:
     tagName: Any