Document missing IPROTO constants

[xuniq]

Product: Tarantool
Root document: https://www.tarantool.io/en/doc/latest/dev_guide/internals/box_protocol/
SME: @

Details

Some IPROTO constants are missing in the docs:

1. Group_id (IPROTO_GROUP_ID)
   Document new space option - is_local #568
   tarantool/tarantool@f64f461

2. IPROTO_DATA (described в box_protocol-body)

3. Old_tuple tarantool/tarantool@03e249b

4. New_tuple
   tarantool/tarantool@03e249b

5. Tuple_meta
   tarantool/tarantool@e4cc14f

6. IPROTO_FEATURE_PAGINATION

7. JOIN_META - covered by New protocol stage during JOIN: IPROTO_JOIN_META, IPROTO_JOIN_SNAPSHOT #2276

8. JOIN_SNAPSHOT - covered by New protocol stage during JOIN: IPROTO_JOIN_META, IPROTO_JOIN_SNAPSHOT #2276

Don't forget to update the links to iproto constants in the box.iproto submodule.