fix(curriculum): update CSS Grid review summary to include missing concepts (freeCodeCamp#64500)

Co-authored-by: Ali Farooqi <[email protected]>

Author: alifarooqi

curriculum/challenges/english/blocks/review-css/671a9a0a140c2b9d6a75629f.md

@@ -537,8 +537,10 @@ Using placeholder text is not great for accessibility. Too often, users confuse
 - **Explicit Grid**: You can specify the number of lines or tracks using the `grid-template-columns` or `grid-template-rows` properties.
 - **Implicit Grid**: When items are placed outside of the grid, then rows and columns are automatically created for those outside elements.
 - **`minmax()` Function**: This function is used to set the minimum and maximum sizes for a track. 
+- **Grid Auto-Placement**: The browser automatically places items using the auto-placement algorithm. The `grid-auto-flow` property controls this behavior, using values like `row`, `column`, or `dense` to influence the placement direction and whether empty gaps are backfilled.
 - **Line-based Placement**: All grids have lines. To specify where the item begins on a line, you can use the `grid-column-start` and `grid-row-start` properties. To specify where the item ends on the line, you can use the `grid-column-end` and `grid-row-end` properties. You can also choose to use the `grid-column` or `grid-row` shorthand properties instead.
 - **`grid-template-areas`**: This property is used to provide a name for the items you are going to position on the grid. 
+- **Alignment:** Use `justify-items` and `align-items` to control how items are aligned within their grid areas. Use `justify-self` and `align-self` on individual grid items to override the alignment set on the container.
 
 ## CSS Animation Basics