Adding bug notes for app pages and teams tab

Author: VesaJuvonen

docs/spfx/integrate-with-teams-introduction.md

@@ -19,6 +19,9 @@ There are following benefits on using SharePoint Framework as the platform for y
 > [!IMPORTANT]
 > This feature is currently in preview and is subject to change. It is not currently supported for use in production environments. Your feedback and input around this capability is welcome using the [SharePoint Dev Docs issue list](https://github.com/SharePoint/sp-dev-docs/issues).
 
+> [!IMPORTANT]
+> There is a known **bug** related on the property configuration, which will be addressed. You cannot change default property values or the web part is not successfully added on the tab. Fix for this issue will be rolling out in upcoming days.
+
 ## Development process
 
 You can start developing Microsoft Teams tabs simply by using the `with beta` version of the SharePoint Framework 1.7 packages. High level steps to get started are as follows.

docs/spfx/web-parts/get-started/using-web-part-as-ms-teams-tab.md

@@ -281,6 +281,9 @@ Now we have confirmed that the side-loading is enabled, and we can package our M
 
     ![Add a tab](../../../images/sp-teams-configure-tab.png)
 
+> [!IMPORTANT]
+> There is a known **bug** related on the property configuration, which will be addressed. You cannot change default property values or the web part is not successfully added on the tab. Fix for this issue will be rolling out in upcoming days.
+
 Your custom tab has been added on the Microsoft Teams channel and you can see how the code is reacting that it's in Microsoft Teams context. Theme of the web part is by default coming from the underlaying SharePoint site.
 
 ![Custom tab added](../../../images/sp-teams-custom-tab-added.png)

docs/spfx/web-parts/single-part-app-pages.md

@@ -12,6 +12,9 @@ Single part app pages provides a capability to host SharePoint Framework web par
 > [!IMPORTANT]
 > This feature is currently in preview and is subject to change. It is not currently supported for use in production environments. Your feedback and input around this capability is welcome using the [SharePoint Dev Docs issue list](https://github.com/SharePoint/sp-dev-docs/issues).
 
+> [!IMPORTANT]
+> This capability has been temporarely blocked due a **bug**. Fix for this issue will be rolling out in upcoming days.
+
 App pages have following characterers:
 
 * Single Part App Pages cannot be edited by end users using browser