fix logic issue in godelscript documents

Author: ValKmjolnir

Diff for: doc/4_godelscript_language.en.md

@@ -1172,10 +1172,18 @@ fn default_java_db() -> JavaDB {
     return JavaDB::load("coref_java_src.db")
 }
 
+fn usedMethod(m: Method) -> bool {
+    for(c in CallableBinding(default_java_db())) {
+        if (c.getCallee().key_eq(m)) {
+            return true
+        }
+    }
+}
+
 // find unused methods
 fn unused_method(unused: string) -> bool {
-    for(c in Callable(default_java_db()), method in Callable(default_java_db()), caller in method.getCaller()) {
-        if (c != caller && unused = method.getSignature()) {
+    for(m in Method(default_java_db())) {
+        if (!usedMethod(m) && unused = m.getSignature()) {
             return true
         }
     }

Diff for: doc/4_godelscript_language.md

@@ -1172,10 +1172,18 @@ fn default_java_db() -> JavaDB {
     return JavaDB::load("coref_java_src.db")
 }
 
+fn usedMethod(m: Method) -> bool {
+    for(c in CallableBinding(default_java_db())) {
+        if (c.getCallee().key_eq(m)) {
+            return true
+        }
+    }
+}
+
 // find unused methods
 fn unused_method(unused: string) -> bool {
-    for(c in Callable(default_java_db()), method in Callable(default_java_db()), caller in method.getCaller()) {
-        if (c != caller && unused = method.getSignature()) {
+    for(m in Method(default_java_db())) {
+        if (!usedMethod(m) && unused = m.getSignature()) {
             return true
         }
     }