vcs: Minor fixes to handout.
1. Made madhu's commit shorter to fit in one line.
2. Change Author details to have just the Name.
3. Change some punctuation.
vcs: Introduce commit with -u and -m parameters
commit is now introduced with -u and -m parameters. This fixes a
couple of problems --
1) hg sometimes doesn't allow commits without username
2) vi(m) is the default editor -- most people can't use it (yet).