Added comments

handler/country.go

@@ -27,6 +27,6 @@ func Chandler(w http.ResponseWriter, r *http.Request) {
 		}
 	} else {
 		// need to check error for content when setting header (pkg.CorrectHeader)
-		http.Error(w, "An error occured", pkg.CorrectHeader(err))
+		http.Error(w, "An error occurred", pkg.CorrectHeader(err))
 	}
 }

handler/diag.go

@@ -11,7 +11,7 @@ func Dhandler(w http.ResponseWriter, r *http.Request) {
 	var diagnostics pkg.Diag
 
 	if err := pkg.GetDiag(&diagnostics); err != nil {
-		http.Error(w, "An error occured", http.StatusBadGateway)
+		http.Error(w, "An error occurred", http.StatusBadGateway)
 	}
 
 	w.Header().Set("Content-Type", "application/json")

handler/species.go

@@ -21,6 +21,6 @@ func Shandler(w http.ResponseWriter, r *http.Request) {
 		}
 	} else {
 		w.WriteHeader(pkg.CorrectHeader(err))
-		_, _ = fmt.Fprintln(w, "An error occured")
+		_, _ = fmt.Fprintln(w, "An error occurred")
 	}
 }

pkg/diag.go

@@ -36,6 +36,7 @@ func GetDiag(d* Diag) error {
 	return nil
 }
 
+// Gets GBIF-api status code
 func getGbifStatus(d *Diag) error {
 	resp, err := http.Get(gbifApi)
 	if err != nil {
@@ -45,6 +46,7 @@ func getGbifStatus(d *Diag) error {
 	return nil
 }
 
+// Gets country-api status code
 func getRestStatus(d *Diag) error {
 	resp, err := http.Get(restApi)
 	if err != nil {