Mention endianness and alignment in section ArrayBuffers, binary arrays

Ninguém assumiu esta issue ainda.

* Alignment: My browser (Firefox 87.0 on Linux x86_64) doesn't let me create an unaligned Uint16Array. I. e., `new Uint16Array(b, 1, 1)` on a 4-byte array buffer gives `RangeError: attempting to construct out-of-bounds TypedArray on ArrayBuffer`. In the standard that is [22.2.1.5](https://262.ecma-international.org/6.0/#sec-%typedarray%-buffer-byteoffset-length).13a.

* Endianness: Uint16Array is little-endian on my machine. I just learned that this is machine dependent ([https://stackoverflow.com/questions/7869752/javascript-typed-arrays-and-endianness](Stackoverflow)). In contrast, `dataView.getUint16()` is big-endian, unless the second argument is true.

Hope this helps.

Encontre a seção do tutorial intitulada “ArrayBuffers, binary arrays” e revise a explicação existente sobre arrays tipados e DataView. Adicione notas claras cobrindo as restrições de alinhamento e a distinção de endianness descritas na issue, incluindo o comportamento relevante de Uint16Array e dataView.getUint16(). Está concluído quando os leitores conseguirem entender ambas as ressalvas a partir dessa seção.

Escrita pelo modelo de indexação a partir do texto da issue.