Improve documentation of the binary module

[Maria-12648430]

• Many functions in this module are documented as "Same as same-function-with-different-arity(..., Default)", which can be grouped together into a single paragraph which mentions the defaults.
• The order of the decode_hex, decode_unsigned, encode_hex and encode_unsigned was mingled, ie not in the usual alphabetical order; it might be debatable whether or not opposing functions should be ordered such that they are grouped together (decode_hex, encode_hex, decode_unsigned, encode_unsigned vs decode_hex, decode_unsigned, encode_hex, encode_unsigned), but the current order was off in any case.
• The documentation for copy explicitly stated that a badarg exception will be raised if N < 0. As the specs already state that N = integer() >= 0, this sentence is IMO redundant.

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CT Test Results

       2 files       91 suites   40m 4s ⏱️
1 935 tests 1 658 ✔️ 277 💤 0 ❌
2 237 runs  1 943 ✔️ 294 💤 0 ❌

Results for commit 0ac7a38.

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// Erlang/OTP Github Action Bot

[kikofernandez]

Looks good to me. I will wait until Monday in case someone from OTP wants to check this as well.
Merging on Monday