avoid putting overridden impls in members category unless necessary

The logic here is that user doesn't really care about whether the
function is overridden unless there is a custom documentation
specified for the override, which itself is rare.

docgen/eolian_utils.lua

@@ -716,11 +716,30 @@ find_callables = function(cl, omeths, events, written, no_overrides)
     end
 end
 
+local has_custom_doc = function(impl, cl, no_overrides)
+    -- we don't care, let it pass
+    if not no_overrides then
+        return true
+    end
+    -- defined in this class, always has its own doc
+    if impl:class_get() == cl then
+        return true
+    end
+    -- otherwise check if this has *any* part of doc...
+    if impl:documentation_get(eolian.function_type.PROP_GET) or
+       impl:documentation_get(eolian.function_type.PROP_SET) or
+       impl:documentation_get(eolian.function_type.UNRESOLVED)
+    then
+        return true
+    end
+    return false
+end
+
 M.callables_get = function(cl, no_overrides)
     local written = {}
     local meths, omeths, evs = {}, {}, {}
     for impl in cl:implements_get() do
-        if not no_overrides or impl:class_get() == cl then
+        if has_custom_doc(impl, cl, no_overrides) then
             local ifunc = impl:function_get()
             written[M.obj_id_get(ifunc)] = true
             meths[#meths + 1] = { cl, impl }

gendoc.lua

@@ -451,7 +451,7 @@ local build_class = function(cl)
         f:write_nl()
     end
 
-    local meths, omeths, ievs = eoutils.callables_get(cl)
+    local meths, omeths, ievs = eoutils.callables_get(cl, true)
 
     f:write_h("Members", 2)
     write_functable(f, cl, meths, true)