#298 Use term "log messages" instead of "Logdoc" in specdocs

[Ernst de Haan]

In the generated specification documentation, the term "Logdoc" is used, while that term will not ring a bell with someone new to XINS. I suggest changing it to use the term "Log messages" instead.

I've already changed this in the XINS branch at github:
http://github.com/znerd/xins/blob/master/src/xslt/specdocs/api_to_html.xslt
http://github.com/znerd/xins/blob/master/src/xslt/specdocs/function_to_html.xslt