Use a string NodeImage name in the custom AMI example

[Sanjays2402]

Description

Fixes #2075.

The custom EC2 AMI example passes name=None to NodeImage, whose documented type is str. Use "Netflix Asgard", matching the image described in the example. The AMI ID and driver configuration are unchanged.

Validation: executed the complete example with a mock driver and verified the real NodeImage passed to create_node has the expected string name, AMI ID, and driver. Black and git diff --check passed. Prepared with Codex.

Status

done, ready for review

Checklist

• Code linting
• Documentation
• Tests (example exercised with a mock driver)
• ICLA (documentation-only change)

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.61%. Comparing base (cddf127) to head (58f0c25).

Additional details and impacted files

@@           Coverage Diff           @@
##            trunk    #2190   +/-   ##
=======================================
  Coverage   83.61%   83.61%           
=======================================
  Files         352      352           
  Lines       82045    82045           
  Branches     8799     8799           
=======================================
  Hits        68599    68599           
  Misses      10565    10565           
  Partials     2881     2881           

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