Use simpler YAML syntax

It seems the .asf.yaml YAML parser doesn't support all of YAML.
diff --git a/.asf.yaml b/.asf.yaml
index ac9c204..d976e25 100644
--- a/.asf.yaml
+++ b/.asf.yaml
@@ -5,9 +5,7 @@
   pullrequests: notifications@logging.apache.org
   jira_options: link label
 github:
-  description: >
-    Apache Log4j 2 is an upgrade to Log4j that provides significant improvements over its predecessor, Log4j 1.x, and
-    provides many of the improvements available in Logback while fixing some inherent problems in Logback's architecture.
+  description: "Apache Log4j 2 is an upgrade to Log4j that provides significant improvements over its predecessor, Log4j 1.x, and provides many of the improvements available in Logback while fixing some inherent problems in Logback's architecture."
   homepage: https://logging.apache.org/log4j/2.x/
   labels:
     - apache