Updated Path Specific Configuration (markdown)

Path-Specific-Configuration.md

@@ -61,6 +61,8 @@ Usage of fs.configure:
     	assign writes to this collection
   -delete
     	delete the configuration by locationPrefix
+  -disk string
+    	[hdd|ssd] choose between hard drive or solid state drive
   -fsync
     	fsync for the writes
   -locationPrefix string