Fix URLs in iproto PlantUML tables

[p7nov]

Info

Root document: https://www.tarantool.io/en/doc/latest/dev_guide/internals/box_protocol/ - all pages inside that have PlantUML diagrams.

What's wrong?

Some links from PlantUML diagrams are broken.
They have a part of URL attached two times.

Example: IPROTO_SELECT
first link in the request structure table points to https://www.tarantool.io/en/doc/latest/dev_guide/internals/iproto/requests/**tarantool.io/en/doc/latest/dev_guide/internals/iproto/keys**

Root cause

Such URL come from incorrect .puml files. Links inside them should start from [[https://tarantool.io/en/doc/latest/dev_guide/internals/iproto/keys IPROTO_REQUEST_TYPE]]": "IPROTO_SELECT",

Broken links are missing https:// in the beginning.

Planning checklist

• Check and update all .puml files to correct links.