fix: correct test files

Author: nedpals

error_templates/java/test_files/missing_return_error/test.txt

@@ -22,8 +22,7 @@ Since the `addNumbers` method is declared to return an `int`, you need to provid
 ```diff
 public class MissingReturn {
     public int addNumbers(int a, int b) {
--         // Missing return statement
-+         // Missing return statement
+        // Missing return statement
 +         return b;
     }
 

error_templates/java/test_files/parse_end_of_file_error/test.txt

@@ -17,12 +17,11 @@ This error occurs when the compiler expects more code but encounters the end of
 ```
 ## Steps to fix
 ### Complete the code
-Add the missing `}` in line 4
+Add the missing `}` in line 4.
 ```diff
     public static void main(String[] args) {
         System.out.println("This is a sample program.");
--     }
-+     }
+    }
 + }
 
 ```

error_templates/java/test_files/public_class_filename_mismatch_error/test.txt

@@ -17,7 +17,7 @@ public class Right {
 ```
 ## Steps to fix
 ### 1. Rename your file
-Rename the file to "Right.java" to match the class
+Rename the file to "Right.java" to match the class.
 
 ### 2. Rename the public class
 The filename should match the name of the public class in the file. To resolve this, change the class name to match the filename.

error_templates/java/test_files/symbol_not_found_error_missing_method/test.txt

@@ -21,12 +21,11 @@ The error indicates that the compiler cannot find the method `displayArray(int[]
 ```
 ## Steps to fix
 ### Define the missing method.
-Add the missing method `displayArray` to the `Test` class
+Add the missing method `displayArray` to the `Test` class.
 ```diff
         int[] numbers = {1, 2, 3, 4, 5};
         displayArray(numbers);
--     }
-+     }
+    }
 +
 +     private static void displayArray(int[] a) {
 +         // Add code here

error_templates/java/test_files/uninitialized_variable_error/test.txt

@@ -34,8 +34,7 @@ Alternatively, you can assign a value to the variable before using it.
 ```diff
 public class UninitializedVariable {
     public static void main(String[] args) {
--         int number;
-+         int number;
+        int number;
 +         number = 0; // or any other valid value
 
         // Variable 'number' might not have been initialized