Removed italic formatting from title (will not work with Antora)

Signed-off-by: Philip Windecker <philip.windecker@avenyr.de>

Author: philipwindecker

doc/setup/installing_prerequisites.adoc

@@ -3,7 +3,7 @@ ifndef::include-only-once[]
 include::{root-path}_config.adoc[]
 endif::[]
 [#top-installing-osi-prerequisits]
-= Installing _protobuf_ for static / dynamic linking
+= Installing protobuf for static / dynamic linking
 
 == Prerequisites