Add docs target to generate documentation.

src/core/parse.c

@@ -609,7 +609,7 @@ static int parsergc(void *p, size_t size) {
 }
 
 static JanetAbstractType janet_parse_parsertype = {
-    ":core.parser",
+    ":core/parser",
     parsergc,
     parsermark
 };