Update xml_to_md.py

[devabhishekpal]

What changes were proposed in this pull request?

Provide a one-liner summary of the changes in the PR Title field above.
It should be in the form of HDDS-1234. Short summary of the change.

Please describe your PR in detail:

• What changes are proposed in the PR? and Why? It would be better if it is written from third person's
  perspective not just for the reviewer.
• Provide as much context and rationale for the pull request as possible. It could be copy-paste from
  the Jira's description if the jira is well defined.
• If it is complex code, describe the approach used to solve the issue. If possible attach design doc,
  issue investigation, github discussion, etc.

Examples of well-written pull requests:

• #3980
• #5265
• #4701
• #5283
• #5300

What is the link to the Apache JIRA

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request which starts with the corresponding JIRA issue number. (e.g. HDDS-XXXX. Fix a typo in YYY.)

(Please replace this section with the link to the Apache JIRA)

How was this patch tested?

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(If this patch involves UI changes, please attach a screenshot; otherwise, remove this.)