serverconfig: remove TODOs about FindHandlerByType since its behaviour now complies with the docs

Change-Id: I7ca754c0a27aa0ffc1bc1b4fe034a1c17f1876ef

pkg/blobserver/handlers/upload.go

@@ -96,7 +96,6 @@ func vivify(blobReceiver blobserver.BlobReceiveConfiger, fileblob blobref.SizedB
 		return errors.New("blobReceiver config has no HandlerFinder")
 	}
 	JSONSignRoot, sh, err := hf.FindHandlerByType("jsonsign")
-	// TODO(mpl): second check should not be necessary, and yet it happens. Figure it out.
 	if err != nil || sh == nil {
 		return errors.New("jsonsign handler not found")
 	}

pkg/serverconfig/serverconfig.go

@@ -170,8 +170,6 @@ func (hl *handlerLoader) GetRequestContext() (req *http.Request, ok bool) {
 	return hl.context, hl.context != nil
 }
 
-// TODO(mpl): investigate bug: when I used it to find /sighelper/ within
-// makeCamliHandler, it returned "/sighelper", nil, nil.
 func (hl *handlerLoader) FindHandlerByType(htype string) (prefix string, handler interface{}, err error) {
 	for prefix, config := range hl.config {
 		if config.htype == htype {