[website] Fix author titles (#1309)

Author: michaelkoepf

website/blog/authors.yml

@@ -18,19 +18,19 @@
 
 jark:
   name: Jark Wu
-  title: PMC member of Apache Fluss
+  title: PPMC member of Apache Fluss (Incubating)
   url: https://github.com/wuchong
   image_url: https://github.com/wuchong.png
 
 giannis:
   name: Giannis Polyzos
-  title: PMC member of Apache Fluss
+  title: PPMC member of Apache Fluss (Incubating)
   url: https://github.com/polyzos
   image_url: https://github.com/polyzos.png
 
 yuxia:
   name: Luo Yuxia
-  title: PMC member of Apache Fluss
+  title: PPMC member of Apache Fluss (Incubating)
   url: https://github.com/luoyuxia
   image_url: https://github.com/luoyuxia.png