[PATCH] DOC: Add note about "* " prefix in CSV stats

[Daniel Schneller]

Just a little documentation patch I wrote, after stumbling across this: https://github.com/dschneller/bosun/commit/6ca776dd6543d123a135b4a84a5e3e66093c3986

0001-DOC-Add-note-about-prefix-in-CSV-stats.patch
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Cheers, Daniel --  Daniel Schneller Principal Cloud Engineer   CenterDevice GmbH                  | Hochstraße 11                                    | 42697 Solingen tel: +49 1754155711                | Deutschland daniel.schnel...@centerdevice.de   | www.centerdevice.de Geschäftsführung: Dr. Patrick Peschlow, Dr. Lukas Pustina, Michael Rosbach, Handelsregister-Nr.: HRB 18655, HR-Gericht: Bonn, USt-IdNr.: DE-815299431