#243 Minor typo in manpage

[Tomas Hoger]

"Line-Oriented interface" section of the man page gives hint on how to search for definition of the main function. That example has a typo: ‘‘lmain’’ while it should be "1main" (mind the lowercase L vs. number 1 difference).

While checking why example from man page does not work after copy-n-paste to cscope, I came across this man page http://www1.bell-labs.com/project/wwexptools/cscope/cscope.html which has bit more info than the one currently shipped with cscope. Not sure if licensing may allow getting parts of it to the official man page.