#6744 follow-up: convert Note text to Note blob

Description:

In PR #6744, a Note text line was added to the page, but without the
common Note blob used in the default MS Docs code style.

This PR updates the Note to follow the MS Docs code style by adding the
MarkDown Note blob indent markers and the [!NOTE] tag or header. The
text content itself remains unchanged.

Changes proposed:
- Convert the Note text line to a standard MS Docs Note blob
- Remove redundant end-of-line whitespace (blanks) throughout the page

Ticket closure or reference:

Ref. PR #6744

windows/security/identity-protection/hello-for-business/hello-hybrid-cert-whfb-settings-dir-sync.md

@@ -16,6 +16,7 @@ localizationpriority: medium
 ms.date: 10/23/2017
 ms.reviewer: 
 ---
+
 # Configure Hybrid Windows Hello for Business: Directory Synchronization
 
 **Applies to**
@@ -61,7 +62,8 @@ Sign-in a domain controller or management workstation with _Domain Admin_ equiva
 5. In the **Enter the object names to select** text box, type the name of the Azure AD Connect service account.  Click **OK**.
 6. Click **OK** to return to **Active Directory Users and Computers**.
 
-Note: if your AD forest has multiple domains. Please make sure you add the ADConnect sync service account (ie. MSOL_12121212) into "Enterprise Key Admins" group to gain permission across the domains in the forest.
+> [!NOTE]
+> if your AD forest has multiple domains. Please make sure you add the ADConnect sync service account (ie. MSOL_12121212) into "Enterprise Key Admins" group to gain permission across the domains in the forest.
 
 ### Section Review