* Update information about jsondoc/jsondoc2
Manual was missing information about jsondoc2 which made it seem like
it didn't exist at all. This commit adds mention of the jsondoc2
command along with an example.
* Renamed jsondoc2 similar to doc2 and updated docs
doc2 was recently renamed to doc while doc was renamed to doc0. This
commits renames jsondoc to jsondoc2 and jsondoc2 to jsondoc0 to behave
tha same way. The documentation for doc/jsondoc was also lagging behind
this change which has also been fixed. I interpreted this as a soft
deprecation of doc and jsondoc and therefore removed them from the
auto-complete lists.
