Improve documentation of syntax parameters, and make some use of markup slightly more consistent.
Improve documentation of syntax parameters, and make some use of
markup slightly more consistent.

LuaDist/lrexlib-pcre,LuaDist/lrexlib-posix,LuaDist/lrexlib-pcre,LuaDist/lrexlib-posix,LuaDist/lrexlib-oniguruma,StoneDot/lrexlib,LuaDist/lrexlib-gnu,StoneDot/lrexlib,LuaDist/lrexlib-gnu,LuaDist/lrexlib-oniguruma,LuaDist/lrexlib-tre,LuaDist/lrexlib-tre