Updating namespaces docs

[ilongin]

Updating Studio default values for namespace and project.

Summary by Sourcery

Documentation:

• Change default Studio namespace from users to @<username> and project from username to default, and update example output accordingly.

[sourcery-ai]

Reviewer's Guide

This PR revises the Studio section of the namespaces guide to reflect new default naming conventions for namespace and project.

File-Level Changes

Change	Details	Files
Update default namespace and project values in Studio docs	Change default namespace from users to @<username> Change default project from username to default Adjust example save path comment to @jondoe.default.metrics	docs/guide/namespaces.md

Possibly linked issues

• remove docstring from DataModel.__pydantic__init_subclass__ #123: The PR updates the Studio namespace and project default values in the documentation to match the new defaults, fulfilling the issue request.

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[sourcery-ai]

Hey @ilongin - I've reviewed your changes and they look great!

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Deploying datachain-documentation with    Cloudflare Pages

Latest commit:	fb77cd6
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View logs

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.70%. Comparing base (91029e7) to head (fb77cd6).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1210      +/-   ##
==========================================
- Coverage   88.72%   88.70%   -0.03%     
==========================================
  Files         152      152              
  Lines       13577    13577              
  Branches     1890     1890              
==========================================
- Hits        12046    12043       -3     
- Misses       1088     1090       +2     
- Partials      443      444       +1     

Flag	Coverage Δ
datachain	88.63% <ø> (-0.03%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

see 1 file with indirect coverage changes

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