comments for cars-assemble analyzer

analyzer-comments/java/cars-assemble/avoid_using_return_in_else_statement.md

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+# avoid using return in else statement
+When an `if` block ends with a return statement, the subsequent `else` is redundant.
+Removing the `else` can make the code cleaner and easier to read.

analyzer-comments/java/cars-assemble/prefer_storing_constant_in_field.md

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+# prefer storing constant in field
+The value 221 is a magic number: a hard-coded constant without explanation.
+To improve readability and maintainability, replace repeated or unexplained values with a named constant.