refactor PR title validation script: split long format guidance lines for improved readability

Author: allnes

scripts/check_pr_title.py

@@ -35,7 +35,9 @@ def main():
         print("❌ Invalid PR title format")
         print("\nAllowed PR title formats:")
         print(
-            "- [TASK] <Task Number>-<Variant number>. <Last Name> <First Name> <Middle Name>. <Group number>. <Task name>."
+            "- [TASK] <Task Number>-<Variant number>. "
+            "<Last Name> <First Name> <Middle Name>. "
+            "<Group number>. <Task name>."
         )
         print(
             "  Example: [TASK] 2-12. Иванов Иван Иванович. 2341-а234. Вычисление суммы элементов вектора."