[8pt] Update formatting in "Binary protocol"

[NickVolynkin]

A follow-up of #1661. Use code-block to format code examples. Improve other things that can be improved.

Reference on markup syntax: https://www.tarantool.io/ru/doc/latest/contributing/docs/markup/#code-snippets

For example, change:

IPROTO_SELECT=0x01, IPROTO_INSERT=0x02, IPROTO_REPLACE=0x03,...

to

IPROTO_SELECT=0x01
IPROTO_INSERT=0x02
IPROTO_REPLACE=0x03
...

For the latter, use .. code-block:: ini.

[pgulutzan]

If you use a browser to look at the .html that is produced from the latest commit, and search for grave accent (backtick) `, it will show you a few errors.