RFR: JDK-8233383 Various minor fixes

Fri Nov 1 10:43:26 UTC 2019

This is a collection of minor fixes, that I've been gathering whenever I 
detected something that I thought needed fixing, but that by itself 
seemed to small to be worth the effort of opening a JBS issue.

Summary of changes:
* Unify creation of html from markdown for all *.md files in doc.
* Move GensrcModuleInfo.gmk to gensrc directory.* Remove extraneous 
chars in autoconf source file header
* Update documentation for new generated build names
* Use - and not / for Windows CLI options
* Fix typos

Bug: https://bugs.openjdk.java.net/browse/JDK-8233383
WebRev: 
http://cr.openjdk.java.net/~ihse/JDK-8233383-various-minor-fixes/webrev.01

/Magnus