Add markup to BSD-Attribution-HPND-disclaimer.xml

[coky-t]

The following license is considered to be BSD-Attribution-HPND-disclaimer, but there are some inconsistencies in the license text.

https://github.com/ppp-project/ppp/blob/v2.5.0/pppd/eui64.c#L6-L33
https://github.com/ppp-project/ppp/blob/v2.5.0/pppd/mppe.h#L6-L33

I've added some markup to improve it.

[jlovejoy]

is there a corresponding issue for this, @coky-t ?

[coky-t]

There are no currently open issues related to this pull request.
I apologize if this violates the pull request rules.

The related issue is already closed, issue #2323.
This issue was addressed in pull request #2359, but the markup in that pull request seems insufficient.

There are two promblems:

1. In paul-mackerras-binary, the subject of the disclaimer sentence is "THE AUTHORS", so the verb "DISCLAIM" is used instead of "DISCLAIMS".
2. paul-mackerras-binary does not use the proper noun "CARNEGIE MELLON UNIVERSITY". Therefore, all occurrences of "CARNEGIE MELLON UNIVERSITY" in BSD-Attribution-HPND-disclaimer need to be addressed with markup, but there is still one occurrence remaining in the disclaimer text.

I have created this pull request to address these two problems.

[coky-t]

@jlovejoy,
Could you please confirm if I provided enough information in the above comment?
Or should I just abandon this pull request and create a new issue?