Fix typos in Worksheet3

Worksheet/Worksheet3.md

@@ -34,7 +34,7 @@ title: Worksheet 3
 - Create a class called `Sum` to hold an array of integers and expose a method
   computing their sum
 - Create a main class to pass all the command-line arguments to this function
-  and print the result (don't forget the types ! `String[]` $neq$ `int[]`)
+  and print the result (don't forget the types ! `String[]` $\neq$ `int[]`)
 - Compile and test
 - Add a new class called `Product` to the `fr.insa_lyon.ist_4_jav.calculator`
   package doing what you expect (the same as `Sum` with the product of all the
@@ -52,14 +52,14 @@ title: Worksheet 3
 
 - Start over from the greeter, but modify it to read the name of the person from
   standard input instead of from the command-line the program was called on
-  (look up `System.in.read` and friends for usage and help)
+  (look up `System.console.readLine()` and friends for usage and help)
 - Print a message explaining that the user should enter their name before the
   call to the previous function
 - Compile and test
 - Modify it to detect if the user entered the litteral value `quit` and print a
   special message in that case
 - Add a boolean variable to hold whether the program should keep running or not
-  and initialized to `true` and make the blog handling `quit` set it to `false`
+  and initialized to `true` and make the block handling `quit` set it to `false`
 - Now modify the main function to become a `while` loop which checking the state
   of this variable to continue, and simply keep printing the name otherwise