Remove outdated editable mode warning from docs

[mohammed-saalim]

Summary

Removed outdated warning about modules not being importable directly in editable mode, as this issue has been resolved.

Changes

• Removed the warning section from docs/source/using-executorch-building-from-source.md
• Direct imports like from executorch.exir import CaptureConfig now work correctly in editable mode

Context

The warning referenced issue #9558 which has since been fixed. The workaround is no longer necessary.

Fixes #11229
Supersedes #11245

cc @larryliu0820 @mergennachin @byjlw

[pytorch-bot]

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[Copilot]

Pull request overview

Removes an outdated warning from the “building from source” documentation that claimed certain ExecuTorch Python modules were not importable when installed in editable mode (pip -e), reflecting that the underlying issue has been resolved.

Changes:

• Deleted the warning block that referenced issue #9558 and suggested an import workaround for editable installs.

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