fix: some typos uncovered during the session

notebooks/0 Intro.ipynb

@@ -154,7 +154,7 @@
     "\n",
     "![GOTO xkcd comic](https://imgs.xkcd.com/comics/goto.png)\n",
     "\n",
-    "We will see logs of examples of this -- in section 2, especially."
+    "We will see lots of examples of this -- in section 2, especially."
    ]
   },
   {

notebooks/2.4 Context Managers.ipynb

@@ -15,7 +15,7 @@
     "    txt = f.readlines()\n",
     "```\n",
     "\n",
-    "When you enter the with block, `__enter__` is called and the result is assigned to the `as` target, if there is one. Then when you leave the block, `__exit__` is called. If you leave via an exception, `__exit__` gets special arguments that let you even decide what to do based on that the exception is - or even handle the exception and continue. `contextlib` has several simple context managers, like `redirect_stdout`, `redirect_stdout`, and `suppress`:"
+    "When you enter the with block, `__enter__` is called and the result is assigned to the `as` target, if there is one. Then when you leave the block, `__exit__` is called. If you leave via an exception, `__exit__` gets special arguments that let you even decide what to do based on that the exception is - or even handle the exception and continue. `contextlib` has several simple context managers, like `redirect_stdout`, `redirect_stderr`, and `suppress`:"
    ]
   },
   {

notebooks/2.5 Static Typing.ipynb

@@ -276,7 +276,7 @@
     "\n",
     "\n",
     "class Duck(Protocol):\n",
-    "    def quack() -> str:\n",
+    "    def quack(self) -> str:\n",
     "        ..."
    ]
   },