[doc] Python worker doc dict fix

src/content/docs/workers/languages/python/examples.mdx

@@ -24,7 +24,8 @@ async def on_fetch(request, env):
     params = parse_qs(url.query)
 
     if "name" in params:
-        greeting = "Hello there, {name}".format(name=params["name"][0])
+        name = params["name"][0]
+        greeting = f"Hello there, {name}"
         return Response(greeting)
 
 
@@ -40,8 +41,8 @@ async def on_fetch(request, env):
 from workers import Response
 
 async def on_fetch(request):
-    name = (await request.json()).name
-    return Response("Hello, {name}".format(name=name))
+    name = (await request.json())["name"]
+    return Response(f"Hello, {name}")
 ```
 
 ## Emit logs from your Python Worker

src/content/docs/workers/languages/python/index.mdx

@@ -67,7 +67,7 @@ Python workers can be split across multiple files. Let's create a new Python fil
 
 ```python
 def hello(name):
-    return "Hello, " + name + "!"
+    return f"Hello, {name}!"
 ```
 
 Now, we can modify `src/entry.py` to make use of the new module.
@@ -97,7 +97,7 @@ from workers import Response
 from hello import hello
 
 async def on_fetch(request):
-    name = (await request.json()).name
+    name = (await request.json())["name"]
     return Response(hello(name))
 ```