Update docs

Author: vascocosta

docs/reference.md

@@ -11,34 +11,25 @@ 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 slice(list: List, start: Int, end: Int): List](https://gluonscript.org/reference.html#fn-slicelist-list-start-int-end-int-list)
 
 ## Module `conv`
 
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 ## Module `env`
 
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 ## Module `http`
 
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 ## Module `io`
 
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 ## Module `json`
 
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 ## Module `strings`
 
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 ---
 
 ## Module: `core`