doc: Drop redundant app-name in install section

Change-Id: I6ec3c42efd3eb958f832ff9a797ddaa3dae4a99a
diff --git a/doc/manuals/chapters/install.adoc b/doc/manuals/chapters/install.adoc
index 9ef654b..ed38296 100644
--- a/doc/manuals/chapters/install.adoc
+++ b/doc/manuals/chapters/install.adoc
@@ -1,4 +1,4 @@
-== {app-name} Installation
+== Installation
 
 === Trial Builder