Make SSD warning less alarmist

README.md

@@ -33,13 +33,13 @@ Here is an overview over all variables you can set in `vagrant.json` or
 * `memory`: this specifies the size of the RAM in bytes.
 * `cpus`: this specifies the number of cores for your VM.
 * `headless`: this sets GUI on or off.
-* `vagrant_cloud_token`: here you can specify the vagrant cloud token for 
-  uploading your box to the vagrantcloud. If you don't have a vagrant cloud 
+* `vagrant_cloud_token`: here you can specify the vagrant cloud token for
+  uploading your box to the vagrantcloud. If you don't have a vagrant cloud
   token you can ignore this variable. Without a token the boxes will be
   built, but the upload step step will fail.
 * `write_zeroes`: this variable is empty. if you set any string in this
-  variable it will fill the box with zeros to reduce the size. **DO NOT
-  use this if you are running a SSD. It will harm your SSDs lifetime**
+  variable it will fill the box with zeros to reduce the size. *NOTE: This
+  may overly tax your SSD's lifetime.*
 * `boot_wait`: this specifies the time packer should wait for booting up
   the ISO before entering any command.