Update core-concepts-office-add-ins.md

Author: lindalu-MSFT

docs/overview/core-concepts-office-add-ins.md

@@ -27,7 +27,7 @@ For the best foundation for these common features and application-specific imple
        :::image type="content" source="../images/office-add-ins-lifecycle-step-1-plan.png" alt-text="illustration of a route winding through mountains":::
    :::column-end:::
    :::column span="3":::
-       **Plan**</br>
+       </br>**Plan**</br>
        [Learn the best practices and system requirements for Office Add-ins.](../concepts/add-in-development-best-practices.md)
    :::column-end:::
 :::row-end:::
@@ -36,7 +36,7 @@ For the best foundation for these common features and application-specific imple
        :::image type="content" source="../images/office-add-ins-lifecycle-step-2-develop.png" alt-text="illustrtion of a plan, a cog, and a wrench":::
    :::column-end:::
    :::column span="3":::
-       **Develop**</br>
+       </br>**Develop**</br>
        [Learn the APIs and patterns to develop Office Add-ins.](../develop/develop-overview.md)
    :::column-end:::
 :::row-end:::
@@ -45,7 +45,7 @@ For the best foundation for these common features and application-specific imple
        :::image type="content" source="../images/office-add-ins-lifecycle-step-3-test-and-debug.png" alt-text="illustration of an eye looking through a magnifying glass":::
    :::column-end:::
    :::column span="3":::
-       **Test and debug**</br>
+       </br>**Test and debug**</br>
        [Learn how to test and debug Office Add-ins.](../testing/test-debug-office-add-ins.md)
    :::column-end:::
 :::row-end:::
@@ -54,7 +54,7 @@ For the best foundation for these common features and application-specific imple
        :::image type="content" source="../images/office-add-ins-lifecycle-step-4-publish.png" alt-text="illustration of a rocket ship being deployed":::
    :::column-end:::
    :::column span="3":::
-       **Publish**</br>
+       </br>**Publish**</br>
        [Learn how to deploy and publish Office Add-ins.](../publish/publish.md)
    :::column-end:::
 :::row-end:::
@@ -63,7 +63,7 @@ For the best foundation for these common features and application-specific imple
        :::image type="content" source="../images/office-add-ins-lifecycle-step-5-reference.png" alt-text="illustration of a large reference book":::
    :::column-end:::
    :::column span="3":::
-       **Reference**</br>
+       </br>**Reference**</br>
        [View the reference documentation for the Office JavaScript APIs, the add-ins manifest, error code lists, and more.](../reference/javascript-api-for-office.md)
    :::column-end:::
 :::row-end:::