Minor edits.

docs/sphinx_docs/lib.rst

@@ -473,7 +473,7 @@ List words
 
 "Swap stack" swap the list on the top of the stack for the stack, and
 put the old stack on top of the new one. Think of it as a context
-switch. Niether of the lists/stacks change their order.
+switch. Neither of the lists/stacks change their order.
 
 .. code:: python
 

docs/sphinx_docs/notebooks/The_Four_Operations.rst

@@ -316,7 +316,7 @@ The other sub-programs would be cancelled.
 “Fulminators”
 ^^^^^^^^^^^^^
 
-Also known as “Futures” or “Promises” (by *everybody* else. “Fulinators”
+Also known as “Futures” or “Promises” (by *everybody* else. “Fulminators”
 is what I was going to call them when I was thinking about implementing
 them in Thun.)