Added documentation examples for class-variable-slots-conflict. (#7151)

Author: mbyrnepr2

doc/data/messages/c/class-variable-slots-conflict/bad.py

@@ -0,0 +1,14 @@
+class Person:
+    __slots__ = ("age", "name", "say_hi",)  # [class-variable-slots-conflict, class-variable-slots-conflict, class-variable-slots-conflict]
+    name = None
+
+    def __init__(self, age, name):
+        self.age = age
+        self.name = name
+
+    @property
+    def age(self):
+        return self.age
+
+    def say_hi(self):
+        print(f"Hi, I'm {self.name}.")

doc/data/messages/c/class-variable-slots-conflict/details.rst

@@ -1 +1,13 @@
-# This is a placeholder for correct code for this message.
+class Person:
+    __slots__ = ("_age", "name",)
+
+    def __init__(self, age, name):
+        self._age = age
+        self.name = name
+
+    @property
+    def age(self):
+        return self._age
+
+    def say_hi(self):
+        print(f"Hi, I'm {self.name}.")