Fix code highlighting

content/en/linux-lifehacks/how-to-create-lvm-logical-volume.md

@@ -14,7 +14,7 @@ sudo fdisk -l
 ```
 to make sure the drive is recognized by the operating system, and to identify the drive name. Output
 of command will be something like this:
-```plaintext
+```
 Disk /dev/vdb: 10 GiB, 10737418240 bytes, 20971520 sectors
 Units: sectors of 1 * 512 = 512 bytes
 Sector size (logical/physical): 512 bytes/512 bytes
@@ -26,7 +26,7 @@ physical volume using the command:
 sudo pvcreate /dev/vdb
 ```
 You will see output like this:
-```plaintext
+```
 kostya@ubuntu-21-04:~$ sudo pvcreate /dev/vdb
 Physical volume "/dev/vdb" successfully created.
 kostya@ubuntu-21-04:~$
@@ -41,7 +41,7 @@ In our case, the command will look like this:
 sudo vgcreate vg-example /dev/vdb
 ```
 The command output will look like this:
-```plaintext
+```
 kostya@ubuntu-21-04:~$ sudo vgcreate vg-example/dev/vdb
 Volume group "vg-example" successfully created
 kostya@ubuntu-21-04:~$
@@ -56,7 +56,7 @@ In our case, it will be:
 sudo lvcreate --size 5G --name lv-example vg-example
 ```
 You will see output like this:
-```plaintext
+```
 kostya@ubuntu-21-04:~$ sudo lvcreate --size 5G --name lv-example vg-example
 Logical volume "lv-example" created.
 kostya@ubuntu-21-04:~$
@@ -71,7 +71,7 @@ To create an xfs filesystem, type the command:
 sudo mkfs.xfs /dev/vg-example/lv-example
 ```
 The command output will look like this:
-```plaintext
+```
 kostya@ubuntu-21-04:~$ sudo mkfs.xfs/dev/vg-example/lv-example
 meta-data =/dev/vg-example/lv-example isize = 512 agcount = 4, agsize = 327680 blks
             = sectsz = 512 attr = 2, projid32bit = 1
@@ -102,7 +102,7 @@ You can verify that the logical volume has been mounted successfully using the c
 df -h /opt
 ```
 The output should be like this:
-```plaintext
+```
 kostya@ubuntu-21-04:~$ df -h /opt/
 Filesystem                         Size  Used Avail Use% Mounted on
 /dev/mapper/vg--random-lv--random  5.0G   68M  5.0G   2% /opt

content/en/linux-lifehacks/how-to-extend-lvm-volume-on-linux.md

@@ -17,7 +17,7 @@ sudo fdisk -l
 
 This is to make sure the drive is recognized by the operating system, and to identify the drive name. Output of the command will be something like this:
 
-```plaintext
+```
 Disk /dev/vdc: 5 GiB, 5368709120 bytes, 10485760 sectors
 Units: sectors of 1 * 512 = 512 bytes
 Sector size (logical/physical): 512 bytes/512 bytes
@@ -32,7 +32,7 @@ sudo pvcreate /dev/vdc
 
 You will see output like this:
 
-```plaintext
+```
     kostya@ubuntu-21-04:~$ sudo pvcreate /dev/vdc
     Physical volume "/dev/vdc" successfully created.
     kostya@ubuntu-21-04:~$
@@ -42,7 +42,7 @@ You will see output like this:
 
 To get a list of available volume groups run this command:
 
-```shell
+```bash
 vgdisplay
 ```
 
@@ -60,7 +60,7 @@ sudo vgextend vg-example /dev/vdc
 
 You will see output like this:
 
-```plaintext
+```
 kostya@ubuntu-21-04:~$ sudo vgextend vg-example /dev/vdc
 Physical volume "/dev/vdc" successfully created.
 Volume group "vg-example" successfully extended
@@ -83,7 +83,7 @@ sudo lvextend --size +2G vg-example/lv-example
 
 You will see output like this:
 
-```plaintext
+```
 kostya@ubuntu-21-04:~$ sudo lvextend --size +2G vg-example/lv-example
 Size of logical volume vg-example/lv-example changed from 5.00 GiB (1280 extents) to 7.00 GiB (1792 extents).
 Logical volume vg-example/lv-example successfully resized.

content/en/linux-lifehacks/linux-how-to-limit-var-log-size.md

@@ -21,7 +21,7 @@ Logrotate rotates almost all log files in the `/var/log` folder every day. For e
 ```bash
 ls /var/log/kern*
 ```
-```plaintext
+```
 /var/log/kern.log    /var/log/kern.log.2.gz  /var/log/kern.log.4.gz
 /var/log/kern.log.1  /var/log/kern.log.3.gz
 ```
@@ -30,7 +30,7 @@ To limit the number of log files, edit the file `/etc/logrotate.d/rsyslog`. Look
 ```bash
 cat /etc/logrotate.d/rsyslog
 ```
-```plaintext
+```
 /var/log/syslog
 /var/log/mail.info
 /var/log/mail.warn

content/en/linux-lifehacks/linux-monitoring-with-telegram-alerts.md

@@ -57,7 +57,7 @@ docker ps
 ```
 
 The command output should contain 5 containers: prometheus, grafana, alertmanager, node-exporter, grafana.
-```plaintext
+```
 CONTAINER ID   IMAGE                              COMMAND                  CREATED      STATUS                PORTS                       NAMES
 46fba26e7234   gcr.io/cadvisor/cadvisor:v0.47.0   "/usr/bin/cadvisor -…"   5 days ago   Up 5 days (healthy)   8080/tcp                    monitoring_cadvisor.1.q02qcn798dh0rydo1dzslylse
 f212e3c66786   prom/alertmanager:v0.25.0          "/bin/alertmanager -…"   6 days ago   Up 6 days             9093/tcp                    monitoring_alertmanager.1.oysziztrqnur7xr0hr82avunz