Update Open-Source Software: xonsh,xxh,x-cmd

[lunrenyi]

Explain

Fix link errors

Types of Changes

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• New addition to list
• Fixing bug in existing item in list
• Removing item from list
• Changing structure (organization) of list

Proposed Changes

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1. If you're adding something to the list, be sure to explain why it should be added.
2. If you're fixing a bug or resolving a feature request, be sure to link to that issue.

PR Checklist

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• I have read the CONTRIBUTING guide
• I have explained why this PR is important
• I have added necessary documentation (if appropriate)

Further Comments

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