docs: adjust wordings for overlay options

index.html

@@ -642,11 +642,11 @@ <h4>Boarding Definition</h4>
           <pre><code class="javascript">const boarding = new Boarding({
   className: 'scoped-class', // className to wrap boarding.js popover
   animate: true, // Animate while changing highlighted element
-  opacity: 0.75, // Background opacity (0 means only popovers and without overlay)
+  opacity: 0.75, // Overlay opacity (0 means only popovers and without overlay)
   padding: 10, // Distance of element from around the edges
   allowClose: true, // Whether clicking on overlay should close or not
   overlayClickNext: false, // Should it move to next step on overlay click
-  overlayColor: 'rgb(0,0,0)', // Background color for the overlay element
+  overlayColor: 'rgb(0,0,0)', // Fill color for the overlay
   doneBtnText: 'Done', // Text on the final button
   closeBtnText: 'Close', // Text on the close button for this step
   nextBtnText: 'Next', // Next button text for this step

readme.md

@@ -260,11 +260,11 @@ Here are the options that Boarding understands:
 const boarding = new Boarding({
   className: "scoped-class", // className to wrap boarding.js popover
   animate: true, // Whether to animate or not
-  opacity: 0.75, // Background opacity (0 means only popovers and without overlay)
+  opacity: 0.75, // Overlay opacity (0 means only popovers and without overlay)
   padding: 10, // Distance of element from around the edges
   allowClose: true, // Whether the click on overlay should close or not
   overlayClickNext: false, // Whether the click on overlay should move next
-  overlayColor: "rgb(0,0,0)", // Background color for the overlay element
+  overlayColor: "rgb(0,0,0)", // Fill color for the overlay
   doneBtnText: "Done", // Text on the final button
   closeBtnText: "Close", // Text on the close button for this step
   nextBtnText: "Next", // Next button text for this step

src/lib/core/overlay.ts

@@ -38,7 +38,7 @@ export interface OverlayTopLevelOptions {
    */
   opacity?: number;
   /**
-   * Background color for the overlay element
+   * Fill color for the overlay
    * @default rgb(0,0,0)
    */
   overlayColor?: string;