Fixes#310
Some files had no newlines, some had 1 newline and some more than 1 newline.
Normalize them all to have only 1 newline at the end of all files.
- don't use g in all examples
- fix option for extended regex (-E is in grep :))
- spell out the -i option and remove a stray `''` from that command
- use the term "expressions" in the example using -e