chore(docs): Fix typo in pitfalls.md (#729)

Author: jfranty

docs/pitfalls.md

@@ -61,7 +61,7 @@ The set of patches generated by Immer should be correct, that is, applying them
 
 ### Always use the result of nested producers
 
-Nested `produce` calls are supported, but note that `produce` will _always_ produce a new state, so even when passing a draft to a nested produce, the changes made by the inner produce won't be visibile in the draft that was passed it, but only in the output that is produced. In other words, when using nested produce, you get a draft of a draft and the result of the inner produce should be merged back into the original draft (or returned). For example `produce(state, draft => { produce(draft.user, userDraft => { userDraft.name += "!" })})` won't work as the output if the inner produce isn't used. The correct way to use nested producers is:
+Nested `produce` calls are supported, but note that `produce` will _always_ produce a new state, so even when passing a draft to a nested produce, the changes made by the inner produce won't be visible in the draft that was passed it, but only in the output that is produced. In other words, when using nested produce, you get a draft of a draft and the result of the inner produce should be merged back into the original draft (or returned). For example `produce(state, draft => { produce(draft.user, userDraft => { userDraft.name += "!" })})` won't work as the output if the inner produce isn't used. The correct way to use nested producers is:
 
 ```javascript
 produce(state, draft => {