docs: fix small typo in comment

Signed-off-by: Matt Gleich <git@mattglei.ch>

internal/apis/strava/tokens.go

@@ -28,7 +28,7 @@ func loadTokens() tokens {
 }
 
 func (t *tokens) refreshIfNeeded() {
-	// add 30 to ensure that token doesn't expire in the next 60 seconds
+	// add 60 to ensure that token doesn't expire in the next 60 seconds
 	if t.ExpiresAt+60 >= time.Now().Unix() {
 		return
 	}