Update docs

Author: vascocosta

docs/reference.md

@@ -10,9 +10,9 @@ Explore the standard library functions available in GluonScript.
 
 ## Module `core`
 
-[fn append(list: List, element: Any): List](https://gluonscript.org/reference.html#fn-appendlist-list-element-any-list)  
-[fn import(file: String): Record](https://gluonscript.org/reference.html#fn-importfile-string-record)  
-[fn len(list: List): Int](https://gluonscript.org/reference.html#fn-lenlist-list-int)  
+[fn append(list: List, element: Any): List](https://gluonscript.org/reference.html#fn-appendlist-list-element-any-list)<br>
+[fn import(file: String): Record](https://gluonscript.org/reference.html#fn-importfile-string-record)<br>
+[fn len(list: List): Int](https://gluonscript.org/reference.html#fn-lenlist-list-int)<br>
 [fn slice(list: List, start: Int, end: Int): List](https://gluonscript.org/reference.html#fn-slicelist-list-start-int-end-int-list)
 
 ## Module `conv`