docs: fixing typos

subjects/java/checkpoints/goodbye-mars/README.md

@@ -2,7 +2,7 @@
 
 ### Instructions
 
-In a file named `GoodbyeMars.java` write a function `goodbyeMars` that returns the string 'Good bye Mars !'.
+In a file named `GoodbyeMars.java` write a function `goodbyeMars` that returns the string 'Goodbye Mars !'.
 
 ### Expected Functions
 
@@ -31,6 +31,6 @@ and its output :
 ```shell
 $ javac *.java -d build
 $ java -cp build ExerciseRunner
-Good bye Mars !
+Goodbye Mars !
 $
 ```

subjects/java/checkpoints/universal-greeting/README.md

@@ -4,9 +4,9 @@
 
 In a file named `UniversalGreeting.java` write a function `greeting` that takes a String language as a parameter and returns a greeting message based on the language as follows:
 
-`FR` : `Bonjour comment allez-vous?`
+`FR`: `Bonjour comment allez-vous?`
 `EN`: `Hello, How are you?`
-`ES` : `Hola, cómo estás?`
+`ES`: `Hola, cómo estás?`
 
 and return an empty string in any other case.
 
@@ -37,6 +37,6 @@ and its output :
 ```shell
 $ javac *.java -d build
 $ java -cp build ExerciseRunner
-Hello, How are you
+Hello, How are you?
 $
 ```