podman-update: fix EXAMPLES

Mainly this fixes an issue of using /dev/zero for block device examples.

Also:
 * fix section title;
 * remove separate cgroup v2 and v1 examples, only leaving one;
 * break long lines.

Signed-off-by: Kir Kolyshkin <[email protected]>

Author: kolyshkin

docs/source/markdown/podman-update.1.md.in

@@ -95,21 +95,21 @@ Changing this setting resets the timer, depending on the state of the container.
 @@option unsetenv.update
 
 
-## EXAMPLEs
+## EXAMPLES
 
-Update a container with a new cpu quota and period.
+Update a container with a new cpu quota and period:
 ```
-podman update --cpus=5 myCtr
+podman update --cpus=0.5 ctrID
 ```
 
-Update a container with all available options for cgroups v2.
+Update a container with multiple options at ones:
 ```
-podman update --cpus 5 --cpuset-cpus 0 --cpu-shares 123 --cpuset-mems 0 --memory 1G --memory-swap 2G --memory-reservation 2G --blkio-weight-device /dev/zero:123 --blkio-weight 123 --device-read-bps /dev/zero:10mb --device-write-bps /dev/zero:10mb --device-read-iops /dev/zero:1000 --device-write-iops /dev/zero:1000 --pids-limit 123 ctrID
-```
-
-Update a container with all available options for cgroups v1.
-```
-podman update --cpus 5 --cpuset-cpus 0 --cpu-shares 123 --cpuset-mems 0 --memory 1G --memory-swap 2G --memory-reservation 2G --memory-swappiness 50 --pids-limit 123 ctrID
+podman update --cpus 5 --cpuset-cpus 0 --cpu-shares 123 --cpuset-mems 0 \\
+  --memory 1G --memory-swap 2G --memory-reservation 2G \\
+  --blkio-weight-device /dev/sda:123 --blkio-weight 123 \\
+  --device-read-bps /dev/sda:10mb --device-write-bps /dev/sda:10mb \\
+  --device-read-iops /dev/sda:1000 --device-write-iops /dev/sda:1000 \\
+  --pids-limit 123 ctrID
 ```
 
 ## SEE ALSO