* pygmentize: various tweaks
- adjust punctuation in main description and first example's description
- mention "list" (rather than "show") in the -L examples, to improve memorability
- explain what lexers are
- clarify which of the parameters are input and output filenames
- simplify last example
* make -O example more didactic
References:
- http://pygments.org/docs/cmdline/#options-and-filters
- http://pygments.org/docs/formatters/#HtmlFormatter
* pygmentize: changes per code review
* pygentize: fix typos