[xml2rfc] HTML List Indentation nit

[hsantos at isdg.net (hector santos)]

Minor Nit:

How can I control the indentation of a list in HTML mode?

For TXT, the alignment for a list is far left (no indentation). For HTML, it
looks like 9-10 characters.

I compared existed published I-Ds and RFCs with both TXT/HTML views and I
see the same thing.

Preferably, I would like to set it myself for both modes (like 4
characters).

Thanks

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Hector