fix wrong comment text for tooltip (#34044)

Author: GeoSot

scss/_variables.scss

@@ -1157,7 +1157,7 @@ $form-feedback-tooltip-font-size:     $tooltip-font-size !default;
 $form-feedback-tooltip-line-height:   null !default;
 $form-feedback-tooltip-opacity:       $tooltip-opacity !default;
 $form-feedback-tooltip-border-radius: $tooltip-border-radius !default;
-// scss-docs-start tooltip-feedback-variables
+// scss-docs-end tooltip-feedback-variables
 
 
 // Popovers