update std::jule::sema

src/standard-library/std-jule-sema.md

@@ -1317,13 +1317,36 @@ Reports whether variable is type inferred.
 ## Traits
 ```
 trait Lookup {
+    // Find imported package.
+    // Returns nil reference if did not found any match.
     fn find_package(mut self, ident: str): &ImportInfo
+
+    // Select imported package.
+    // Returns nil reference if did not found any match.
     fn select_package(mut self, selector: fn(&ImportInfo): bool): &ImportInfo
+
+    // Find variable by identifier and cpp-linked state.
+    // Returns nil reference if did not found any match.
     fn find_var(mut self, ident: str, cpp_linked: bool): &Var
+
+    // Find type alias by identifier and cpp-linked state.
+    // Returns nil reference if did not found any match.
     fn find_type_alias(mut self, ident: str, cpp_linked: bool): &TypeAlias
+
+    // Find structure by identifier and cpp-linked state.
+    // Returns nil reference if did not found any match.
     fn find_struct(mut self, ident: str, cpp_linked: bool): &Struct
+
+    // Find function by identifier and cpp-linked state.
+    // Returns nil reference if did not found any match.
     fn find_fn(mut self, ident: str, cpp_linked: bool): &Fn
+
+    // Find trait by identifier.
+    // Returns nil reference if did not found any match.
     fn find_trait(mut self, ident: str): &Trait
+
+    // Find enum by identifier.
+    // Returns nil reference if did not found any match.
     fn find_enum(mut self, ident: str): &Enum
 }
 ```