Potter XU

[hotfix][docs] Fix typo in alter.md

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## What is the purpose of the change This pull request aims at fixing typo in documents ## Brief change log - *Fix typos in alter.md* ## Verifying this change...

Correct parsing segmentation duration with 40 bits.

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This pull request is fixing bug raised in [#100] by changing the `uint40()` function to get the value of the full 5-bytes slice. > The other usage of `uint40()` function...