Merge pull request MicrosoftDocs#2451 from Ckarst/patch-20

Update polybase-installation.md

Author: PRMerger7

docs/relational-databases/polybase/polybase-installation.md

@@ -35,7 +35,7 @@ manager: "jhubbard"
 
 -   Minimum hard disk space: 2GB  
 
--   TCP/IP connectivity must be enabled. (See [Enable or Disable a Server Network Protocol](../../database-engine/configure-windows/enable-or-disable-a-server-network-protocol.md).)  
+-   TCP/IP connectivity must be enabled. (See [Enable or Disable a Server Network Protocol](../../database-engine/configure-windows/enable-or-disable-a-server-network-protocol.md).)  TCP/IP connectivity is disabled by default with SQL Server Developer and Express Editions. This must be manually enabled for PolyBase to be functional.
 
  **Notes**  
 
@@ -60,7 +60,7 @@ Once you have installed PolyBase as either stand alone or in a scaleout group, y
 
 4.  On the Server Configuration Page, configure the **SQL Server PolyBase Engine Service** and SQL Server PolyBase Data Movement Service to run under the same account.  
 
-    > **IMPORTANT!!** In a PolyBase scale-out group, PolyBase engine and PolyBase data movement service on all nodes must run under the same domain account.  
+    > **IMPORTANT!** In a PolyBase scale-out group, PolyBase engine and PolyBase data movement service on all nodes must run under the same domain account.  
     > See Scaling out PolyBase.  
   
 5.  On the **PolyBase Configuration Page**, select one of the two options. See [PolyBase scale-out groups](../../relational-databases/polybase/polybase-scale-out-groups.md) for more information.