better redirection help

#1
Add a concise example like this in help for redirection and put redirection, sysout, stdout, stderr and syserr indexes in help

rem redirect just stdout to prog.log
javac.exe *.java >prog.log

rem redirect both stdout and stderr to err.log
javac.exe *.java >& err.log

rem redirect stdout to prog.log
javac.exe *.java 1> prog.log

rem redirect stderr to err.log
javac.exe *.java 2> err.log

rem redirect stdout to prog.log and stderr to err.log
javac.exe *.java 1> prog.log 2> err.log
 
Likes: Charles G