docs: Increase root filesystem to 2000 in rhel-minimal.ks

Also add comments to the top of the example kickstarts describing how
they are meant to be used and providing an example cmdline. In some
cases, like rhel-minimal.ks, it can also be used for a live-iso but
requires a couple of extra packages for that to work.

Resolves: rhbz#1730937

docs/rhel-container.ks

@@ -1,5 +1,7 @@
 # Minimal install for containers
-
+# NOTE: This example is for creating a tar, eg.
+# livemedia-creator --project RHEL --releasever 8 --make-tar --ks=rhel-container.ks --no-virt
+#
 # Use network installation
 url --url="http://URL-TO-BASEOS/"
 repo --name=appstream --baseurl="http://URL-TO-APPSTREAM/"

docs/rhel-livemedia.ks

@@ -1,4 +1,7 @@
-#version=DEVEL
+# Live ISO Image
+# NOTE: This example is for creating a live-iso, eg.
+# livemedia-creator --project RHEL --releasever 8 --make-iso --ks=rhel-livemedia.ks --no-virt
+
 # X Window System configuration information
 xconfig  --startxonboot
 # Keyboard layouts

docs/rhel-minimal.ks

@@ -1,4 +1,11 @@
 # Minimal Disk Image
+# NOTE: This example is for creating a disk image, eg.
+# livemedia-creator --project RHEL --releasever 8 --make-disk --ks=rhel-minimal.ks --no-virt
+#
+# Using it for a live-iso will require adding:
+#   dracut-live
+#   system-logos
+
 #
 # Firewall configuration
 firewall --enabled
@@ -27,7 +34,7 @@ bootloader --location=mbr
 # Partition clearing information
 clearpart --all --initlabel
 # Disk partitioning information
-part / --fstype="ext4" --size=1500
+part / --fstype="ext4" --size=2000
 part swap --size=512
 
 %post

docs/rhel-minimized.ks

@@ -1,4 +1,10 @@
 # Minimal Disk Image -- Example of image-minimizer usage in %post
+# NOTE: This example is for creating a disk image, eg.
+# livemedia-creator --project RHEL --releasever 8 --make-disk --ks=rhel-minimized.ks --no-virt
+#
+# Using it for a live-iso will require adding:
+#   dracut-live
+#   system-logos
 #
 # Firewall configuration
 firewall --enabled

docs/rhel-openstack.ks

@@ -1,4 +1,6 @@
 # Minimal Disk Image
+# NOTE: This example is for creating a qcow2 OpenStack disk image, eg.
+# livemedia-creator --project RHEL --releasever 8 --make-disk --image-type=qcow2 --ks=rhel-openstack.ks --no-virt
 #
 # Firewall configuration
 firewall --enabled

docs/rhel-vagrant.ks

@@ -1,6 +1,7 @@
 # Minimal Vagrant Disk Image
+# NOTE: This example is for creating a Vagrant disk image, eg.
+# livemedia-creator --project RHEL --releasever 8 --make-vagrant --ks=rhel-vagrant.ks --no-virt
 #
-
 # Firewall configuration
 firewall --enabled
 # Use network installation