Fix spelling and remove older banner.

Signed-off-by: Matt Spencer <matt.spencer@arm.com>

content/news/2022/welcome_sonatus.md

@@ -5,7 +5,7 @@ Date: "2022-04-19"
 Member: "voting/sonatus"
 
 Banner:
-  Active: true
+  Active: false
   Title: Sonatus joins SOAFEE SIG
   Description: Sonatus joins the SOAFEE SIG as a voting member.
   Background: "banner/banner4.jpg"

content/news/2022/welcome_thundersoft.md

 ---
-Title: "Thundersoft joins SOAFEE SIG"
+Title: "ThunderSoft joins SOAFEE SIG"
 Description: "New member announcement – click for more details on ThunderSoft"
 Date: "2022-04-26"
 Member: "voting/thundersoft"