Update linux-quiz.md (#7056)

* Update linux-quiz.md

- Previously there was a same questions in Q68 and Q88, and Q88 was removed. So added new question at Q88 of similar topic.

- Correct the answer of Q75, that is, option 4: not persistent.

* Update linux-quiz.md

Added reference link for Question no. 88

linux/linux-quiz.md

@@ -633,8 +633,8 @@ if [[ $FILE == $GLOB ]] ;then
 
 - [ ] stored remotely
 - [ ] text
-- [x] persistent
-- [ ] not persistent
+- [ ] persistent
+- [x] not persistent
 
 [Reference](https://sematext.com/blog/journald-logging-tutorial/#toc-journald-storage-4)
 
@@ -740,6 +740,14 @@ cat < in.txt > out.txt
 
 [Reference](http://www.microhowto.info/howto/replace_one_of_the_physical_volumes_in_an_lvm_volume_group.html)
 
+#### Q88. Which command is used to increase the size of a logical volume in LVM?
+- [ ] lvcreate
+- [ ] lvremove
+- [x] lvextend
+- [ ] lvdisplay
+
+[Reference](https://www.redhat.com/sysadmin/resize-lvm-simple)
+
 #### Q89. What is the difference between the apt remove and apt autoremove commands?
 
 - [ ] The apt remove command is a link to apt autoremove, so there are no differences.