Correct docs for DbConnection.State

Fixes #10503

Author: roji

xml/System.Data.Common/DbConnection.xml

@@ -1954,8 +1954,8 @@ This property returns `false` by default; providers that implement <xref:System.
         <ReturnType>System.Data.ConnectionState</ReturnType>
       </ReturnValue>
       <Docs>
-        <summary>Gets a string that describes the state of the connection.</summary>
-        <value>The state of the connection. The format of the string returned depends on the specific type of connection you are using.</value>
+        <summary>Gets a value that describes the state of the connection.</summary>
+        <value>The state of the connection, e.g. open or closed.</value>
         <remarks>To be added.</remarks>
         <related type="Article" href="/dotnet/framework/data/adonet/ado-net-overview">ADO.NET Overview</related>
       </Docs>