mailmap: added/clarified several names

.mailmap

@@ -26,3 +26,12 @@ Marcel Raad <Marcel.Raad@teamviewer.com> <MarcelRaad@users.noreply.github.com>
 Marcel Raad <Marcel.Raad@teamviewer.com> <marcelraad@users.sf.net>
 Anthony Bryan <anthonybryan@gmail.com> <ant@localhost.localdomain>
 Travis Burtrum <admin@moparisthebest.com>
+Dmitry Kostjuchenko <dmitrykos@neutroncode.com>
+Richard Alcock <richard.alcock@gmail.com>
+Jan Ehrhardt <github@ehrhardt.nl>
+Florin Petriuc <petriuc.florin@gmail.com> <pfl@northq.com>
+Pavel Pavlov <pavlov.pavel@gmail.com>
+Jason Juang <jasjuang@gmail.com>
+Carlo Teubner <carlo.teubner@gmail.com>
+Joel Depooter <joel.depooter@safe.com>
+Sebastian Mundry <mundry@outlook.com>

docs/THANKS

@@ -1169,7 +1169,7 @@ Paul Saab
 Pavel Cenek
 Pavel Gushchin
 Pavel Orehov
-Pavel P
+Pavel Pavlov
 Pavel Raiskup
 Pavel Rochnyak
 Pavol Markovic