Update language for "supports" metadata

clarifies that this is the reverse of "suggests" and cites the debian spec

Spec.md

@@ -605,10 +605,10 @@ installed unless the user requests otherwise.
 
 ##### supports
 
-(**v1.2**) A list of mods which are supported by this mod.  This means that
-these mods may not interact or enhance this mod, but they will work correctly
-with it. These mods *should not* be installed, this is an informational field
-only.
+(**v1.2**) A list of mods which are supported by this mod.  This is the reverse
+of `suggests` - when a supported mod is installed, this mod *may* also be
+offered for installation.  This is equivalent to the [enhances specifier from
+Debian](https://www.debian.org/doc/debian-policy/ch-relationships.html).
 
 ##### conflicts