Add link to "The exclude and include fields" in example

Author: ZaneErebos

src/doc/src/reference/publishing.md

@@ -107,7 +107,7 @@ exclude = [
 ```
 
 If you’d rather explicitly list the files to include, Cargo also supports an
-`include` key, which if set, overrides the `exclude` key:
+[`include` key](manifest.md#the-exclude-and-include-fields), which if set, overrides the `exclude` key:
 
 ```toml
 [package]