Fixed lint issues and missing documentation

internal/mock/findATender/handler.go

@@ -22,6 +22,7 @@ const (
 	BasePath     = "/api/1.0/ocdsReleasePackages"
 )
 
+// server serves release packages from a Store; see NewHandler.
 type server struct {
 	store   *Store
 	baseURL string
@@ -39,6 +40,8 @@ func NewHandler(
 	return (&server{store: store, baseURL: baseURL, loc: loc}).handle
 }
 
+// encodeCursor makes the opaque cursor for a next link that resumes at store
+// position i.
 func encodeCursor(i int) string {
 	return base64.RawURLEncoding.EncodeToString([]byte("idx:" + strconv.Itoa(i)))
 }
@@ -62,7 +65,7 @@ func decodeCursor(c string) (int, error) {
 func badRequest(w http.ResponseWriter, msg string) {
 	w.Header().Set("Content-Type", "application/json")
 	w.WriteHeader(http.StatusBadRequest)
-	json.NewEncoder(w).Encode(map[string]string{"error": msg})
+	_ = json.NewEncoder(w).Encode(map[string]string{"error": msg}) // the client has gone
 }
 
 // parseTime reads a query timestamp. Values without an offset (the documented
@@ -93,6 +96,8 @@ type pageQuery struct {
 	limit       int
 }
 
+// handle answers a GET for a page of releases as an OCDS release package,
+// with a links.next when more releases match.
 func (s *server) handle(w http.ResponseWriter, req *http.Request) {
 	if req.Method != http.MethodGet {
 		w.WriteHeader(http.StatusMethodNotAllowed)