Munin contributed plugins

Unify more author names with special characters

Additionally an ambiguous line in the "author" section of a plugin was
removed in order to avoid confusion for the Munin Plugin Gallery parser.

Whitespace cleanup

• remove trailing whitespace
• remove empty lines at the end of files

spelling fixes (2nd try)

typofixes - https://github.com/vlajos/misspell_fixer

Suspicious sections:
plugins/mail/postfix_mail_stats recieved.label
plugins/nginx/nginx_vhost_traffic

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