Fix typo in Endianness docs (#1269)
Fix typo in Endianness docs (#1269)

Fix typo in Endianness docs

Motivation:

Slight typo in docs of Endianness

Modifications:

`significat` -> `significant`

Result:

Less typos, happier users.
apple/swift-nio,apple/swift-nio,apple/swift-nio,apple/swift-nio,apple/swift-nio