fix(docs): correct zone value from itbg1-a to ITBG-1 in examples

[aru-amedeo]

Summary

• The flag in block storage and container registry examples used the wrong value ; the correct value is
• Fixed across all 50 affected files: current docs (EN + IT), all versioned docs (v0.0.15-v0.5.1)

Test plan

• Verify the block storage create example in Use Cases/CloudServer shows
• Verify the container registry examples show

Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.09%. Comparing base (80f5fbe) to head (9b31768).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #238   +/-   ##
=======================================
  Coverage   78.09%   78.09%           
=======================================
  Files          53       53           
  Lines       12461    12461           
=======================================
  Hits         9732     9732           
  Misses       1567     1567           
  Partials     1162     1162           

Flag	Coverage Δ
unittests	78.09% <ø> (ø)

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