update docs

Author: sjenning

docs/man/man1/openshift-start-kubernetes-kubelet.1

@@ -277,8 +277,8 @@ StreamingProxyRedirects=true|false (ALPHA \- default=false)
     Duration between checking http for new data
 
 .PP
-\fB\-\-image\-gc\-high\-threshold\fP=90
-    The percent of disk usage after which image garbage collection is always run. Default: 90%
+\fB\-\-image\-gc\-high\-threshold\fP=85
+    The percent of disk usage after which image garbage collection is always run. Default: 85%
 
 .PP
 \fB\-\-image\-gc\-low\-threshold\fP=80