Afnan Enayet 72735aef17
Update documentation and generate manpage
* update references in `--cc` flag, using modern gcc examples
* note that issues should not be filed if `--cc` flag is used
* remove reference to `HOMEBREW_CC` as it should not be exposed to users
* generate manpages using `brew man` with these changes
2018-07-05 17:25:19 -04:00
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