Tooltip/popover - change the default value for fallbackPlacements (#32437)

The default Popper `fallbackPlacements` value is `[oppositePlacement]`.

- The default value was previously (in v4) `'flip'` that can be achieved by passing the single value in the array, like — `[oppositePlacement]`. Keeping `null` also sets the `fallbackPlacements` to `[oppositePlacement]` (Default value in Popper)
- It's better to have **clockwise** (`['top', 'right', 'bottom', 'left']`) fallback options so that tooltip/popover can be placed to another side even if the opposite placement doesn't fit.

Co-authored-by: XhmikosR <xhmikosr@gmail.com>

site/content/docs/5.0/components/popovers.md

@@ -249,9 +249,9 @@ Note that for security reasons the `sanitize`, `sanitizeFn`, and `allowList` opt
     </tr>
     <tr>
       <td><code>fallbackPlacements</code></td>
-      <td>string | array</td>
-      <td><code>'flip'</code></td>
-      <td>Allow to specify which position Popper will use on fallback. For more information refer to
+      <td>array</td>
+      <td><code>['top', 'right', 'bottom', 'left']</code></td>
+      <td>Define fallback placements by providing a list of placements in array (in order of preference). For more information refer to
       Popper's <a href="https://popper.js.org/docs/v2/modifiers/flip/#fallbackplacements">behavior docs</a></td>
     </tr>
     <tr>

site/content/docs/5.0/components/tooltips.md

@@ -254,9 +254,9 @@ Note that for security reasons the `sanitize`, `sanitizeFn`, and `allowList` opt
     </tr>
     <tr>
       <td><code>fallbackPlacements</code></td>
-      <td>null | array</td>
-      <td><code>null</code></td>
-      <td>Allow to specify which position Popper will use on fallback. For more information refer to
+      <td>array</td>
+      <td><code>['top', 'right', 'bottom', 'left']</code></td>
+      <td>Define fallback placements by providing a list of placements in array (in order of preference). For more information refer to
       Popper's <a href="https://popper.js.org/docs/v2/modifiers/flip/#fallbackplacements">behavior docs</a></td>
     </tr>
     <tr>

site/content/docs/5.0/migration.md

@@ -7,6 +7,12 @@ aliases: "/migration/"
 toc: true
 ---
 
+## v5.0.0-beta2
+
+### JavaScript
+
+- The default value for the `fallbackPlacements` is changed to `['top', 'right', 'bottom', 'left']` for better placement of popper elements.
+
 ## v5.0.0-beta1
 
 ### RTL