doc: s/should/must/
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@ -245,7 +245,7 @@ It is used in two cases:
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Here, _TX Request_ is set to 0.
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Empty Frames are not acknowledged.
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They therefore do not have a _TX sequence number_; this field is reserved and should be set to zero.
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They therefore do not have a _TX sequence number_; this field is reserved and must be set to zero.
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The _RX sequence number_ and all other header fields are used as usual.
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