Feedback fixes: net.box and vshard

[p7nov]

Resolves #3399, #2680, #2459, #2405, #2262, #2273, #2483

net.box:

• Move detailed description from new() (deprecated) to connect() feedback: Module net.box | Tarantool #3399
• Add fetch_schema parameter Document fetch_schema netbox option #2680
• Remove console parameter Delete documentation entry for net.box console #2459
• Remove long deprecated conn:timeout() function [2pt] Delete documentation entry for net.box conn:timeout() #2262
• Fix translation of reconnect_after description [2pt] feedback: Модуль net.box | Bad wording #2405

vshard:

• Fix vshard bucket parameters [2pt] feedback: API reference | no "unavailable" field, but there's "unknown" #2273

server introspection:

• Fix link to metrics/Prometheus and the related text [2pt] feedback: Server introspection | Broken link due to deprecation #2483