app-doc/cantera-docs: update e-mail address of Sergey Torokhov

Update maintainer email for supplementary package for sci-libs/cantera.

Bug: https://bugs.gentoo.org/672596

Signed-off-by: Sergey Torokhov <torokhov-s-a@yandex.ru>
Closes: https://github.com/gentoo/gentoo/pull/12797
Signed-off-by: Joonas Niilola <juippis@gentoo.org>

app-doc/cantera-docs/metadata.xml

@@ -2,7 +2,7 @@
 <!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
 <pkgmetadata>
   <maintainer type="person">
-    <email>torokhov_s_a@mail.ru</email>
+    <email>torokhov-s-a@yandex.ru</email>
     <name>Sergey Torokhov</name>
   </maintainer>
   <maintainer type="project">