docs(scripting-piscine): fix naming of the hello-devops exercise

correct typos

subjects/devops/find-files/README.md

@@ -9,7 +9,6 @@ Create a file `find-files.sh`, which will look for and show, in the current dire
 everything (Regular file, Directory file, Link file,...) that starts with an `a` and,
 all Regular files ending with a `z`
 
-
 - You can use this for testing: https://assets.01-edu.org/devops-branch/find-files-example.zip
 
 - What to use : `find`
@@ -45,6 +44,5 @@ $
 
 You may need to use pipes `(|)` and the logical operator `&&`.
 
-
 > You have to use Man or Google to know more about commands flags, in order to solve this exercise!
 > Google and Man will be your friends!

subjects/devops/joker-num/README.md

@@ -3,7 +3,7 @@
 ### Instructions
 
 In this exercise you are going to create a guessing game.
-The script will receive the number to guess as argument. The number should be between 1 and 100 (inclusive). The player will then have 5 tries to guess the number.
+Create the script `joker-num.sh` which will receive the number to guess as argument. The number should be between 1 and 100 (inclusive). The player will then have 5 tries to guess the number.
 To achieve this you will have to use a `for` loop.
 
 When guessing a valid number the output will be:

subjects/devops/json-researcher/README.md

@@ -2,7 +2,7 @@
 
 ### Instructions
 
-Create the script `json-researcher.sh` wich will show the "name" and the "power" of the superhero with `id: 1`
+Create the script `json-researcher.sh` which will show the "name" and the "power" of the superhero with `id: 1`
 
 - Where to look : https://((DOMAIN))/assets/superhero/all.json
 
@@ -20,6 +20,7 @@ $
 ### Hints
 
 With `curl` you can get the content of the file from the url:
+
 ```console
 $curl https://assets.01-edu.org/devops-branch/HeadTail.txt
 <...>

subjects/devops/strange-files/README.md

@@ -12,7 +12,7 @@ Create the following files:
 
 ```console
 $ ls | cat -e
-"?$*'Hard_file'*$?\"$
+"\?$*'Hard_file'*$?\"$
 firstFile$
 "medium_file!"$
 $