docs: erase whitespace

Author: masiljangajji

exercises/practice/parallel-letter-frequency/.approaches/parallel-stream/content.md

@@ -38,7 +38,7 @@ Using [`ConcurrentHashMap`][ConcurrentHashMap] ensures that frequency counting a
 If there are no strings to process, a validation step avoids unnecessary computation.
 
 To calculate letter frequency, a parallel stream is used.  
-The [`Character.isAlphabetic`][isAlphabetic] method identifies all characters classified as alphabetic in Unicode, covering characters from various languages like English, Korean, Japanese, Chinese, etc., returning `true`. 
+The [`Character.isAlphabetic`][isAlphabetic] method identifies all characters classified as alphabetic in Unicode, covering characters from various languages like English, Korean, Japanese, Chinese, etc., returning `true`.
 Non-alphabetic characters, including numbers, special characters, and spaces, return `false`.
 
 Since we treat uppercase and lowercase letters as the same character (e.g., `A` and `a`), characters are converted to lowercase.