refactor: 重构模板代码

src/main/java/org/jcnc/snow/compiler/parser/function/ASTPrinter.java

@@ -71,7 +71,7 @@ public class ASTPrinter {
                     NodeContext _
             ) -> {
                 System.out.println(pad + "function " + name
-                        + "(params=" + parameters + ", return=" + returnType + ")");
+                        + "(params=" + parameters + ", returns=" + returnType + ")");
                 for (StatementNode stmt : body) {
                     print(stmt, indent + 1);
                 }

src/main/java/org/jcnc/snow/pkg/utils/SnowExample.java

@@ -24,8 +24,8 @@ public final class SnowExample {
         return """
                 module: Math
                     function: main
-                        parameter:
-                        return_type: int
+                        params:
+                        returns: int
                         body:
                             Math.factorial(6)
                             return 0
@@ -33,9 +33,9 @@ public final class SnowExample {
                     end function
                 
                     function: factorial
-                        parameter:
+                        params:
                             declare n: int
-                        return_type: int
+                        returns: int
                         body:
                             declare num1: int = 1
                             loop: