Readme updates (#51)

* Update README.rst

Author: g0rgamesh

README.rst

@@ -29,3 +29,4 @@ This repository provides the following DIB elements:
 * ``nvidia-cuda``: Installs Nvidia CUDA repo and packages for GPU support.
 * ``centos-linkup-extra``: Allows extra time for slow network links to come up.
 * ``centos7-vault``: Deploy older releases of CentOS 7
+* ``cloud-init-growpart-lvm``: Grows designated LVM partition.

elements/cloud-init-growpart-lvm/README.rst

@@ -1,15 +1,13 @@
-=============
+=======================
 cloud-init-growpart-lvm
-=============
+=======================
 
 This element enables growpart for OS images with LVM.
 To enable this element simply include it in the elements list.
 
-* ``DIB_CLOUD_INIT_GROWPART_DEVICES`` list of partition names that needs to be 
-    populated in order for cloud-init to grow it. Populating it is mandatory.
+* ``DIB_CLOUD_INIT_GROWPART_DEVICES``: List of partition names that needs to be populated in order for cloud-init to grow it. **Populating it is mandatory.**
 
 Dependencies:
 
-* ``/usr/bin/growpart`` is needed on the system in order to grow the partition.
-    However it is part of different packages depending on linux family. That
-    is already taken care of by package-installs.
+- ``/usr/bin/growpart``: **is needed on the system in order to grow the partition**,
+  however it is part of different packages depending on linux family. That is already taken care of by package-installs.