packer: Fix style of documentation

packer/README.md

@@ -10,7 +10,7 @@ How to build one VM?
 
 1) Install Packer locally by https://www.packer.io/downloads.html, like (exemple):
 
-::
+
 
     mkdir /opt/packer/
     cd /opt/packer/
@@ -19,7 +19,7 @@ How to build one VM?
 
 2) Building one VM (example)::
   
-::
+
     PATH=$PATH:/opt/packer packer build debian8.json
 
 3) You can watch qemu working on a linux machine (with X running), you just 
@@ -30,8 +30,6 @@ How to build all VMs?
 
 You can use ansible for build all VMs locally, and gzip them:
 
-::
-
     ansible-playbook build.yml -i localhost,
 
 How to upload to shacache?
@@ -44,8 +42,6 @@ eventually, update shacache/shacache.cfg.
 BE CAREFULL, every time you run this command you upload the files to shacache,
 even if the files are there already.
 
-::
-
     ansible-playbook upload.yml -i localhost,
  
 How can I check if all images are on shacache?
@@ -54,7 +50,7 @@ How can I check if all images are on shacache?
 You can use the script 'util/testupload.sh' to know if all generated images 
 are uploaded to shacache.
 
-::
+
 
     bash util/testupload.sh
     # expected output similat to this
@@ -67,7 +63,6 @@ How to download one image from shacache?
 
 The images are downloaded by the SHA512SUM hash of it. Example:
 
-::
 
     sha512sum output-centos72/packer-centos72.gz
     a0247991d2122ba131b...BIGHASH...fa712712b4674be8e332940ade7adccee55a7de7bda0d18 output-centos72/packer-centos72.gz
@@ -81,7 +76,7 @@ How to run locally a downloaded image?
 
 In order to test one image (after unzip), you can run:
 
-::
+
     
     bash util/quick-test IMAGE.qcow2
     # or if you want use X and a monitor you can do: