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Fix: typos

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sync/optimistic.md
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@ -375,7 +375,7 @@ Given all of this, we can say two things:
justify an honest chain. justify an honest chain.
2. **BNs which are syncing can optimistically import transition blocks.** In 2. **BNs which are syncing can optimistically import transition blocks.** In
this case a justified chain already exists blocks. The poison block would be this case a justified chain already exists blocks. The poison block would be
quickly reverted and would have no affect on liveness. quickly reverted and would have no effect on liveness.
Astute readers will notice that (2) contains a glaring assumption about network Astute readers will notice that (2) contains a glaring assumption about network
liveness. This is necessary because a node cannot feasibly ascertain that the liveness. This is necessary because a node cannot feasibly ascertain that the
@ -408,13 +408,13 @@ Such a scenario requires manual intervention.
An alternative to optimistic sync is to run a light client inside/alongside An alternative to optimistic sync is to run a light client inside/alongside
beacon nodes that mitigates the need for optimistic sync by providing beacon nodes that mitigates the need for optimistic sync by providing
tip-of-chain blocks to the execution engine. However, light clients comes with tip-of-chain blocks to the execution engine. However, light clients come with
their own set of complexities. Relying on light clients may also restrict nodes their own set of complexities. Relying on light clients may also restrict nodes
from syncing from genesis, if they so desire. from syncing from genesis, if they so desire.
A notable thing about optimistic sync is that it's *optional*. Should an A notable thing about optimistic sync is that it's *optional*. Should an
implementation decide to go the light-client route, then they can just ignore implementation decide to go the light-client route, then they can just ignore
optimistic sync all together. optimistic sync altogether.
### What if `TERMINAL_BLOCK_HASH` is used? ### What if `TERMINAL_BLOCK_HASH` is used?