Update module documentation (minor)

- Fix fully qualified links: The ceylon doc tool apparently renders the
  fully qualified name as link text (the IDE omits the package name
  part)
- Remove link to parameter: Apparently not supported by the ceylon doc
  tool
- Slight rephrasings, especially in light of ceylon/ceylon-dist#43
  having been dropped from the 1.1 distribution
build.xml: Link to Herd when publishing to Herd

For links like [[Boolean]], [[parseInteger]].