Update xml/Microsoft.Extensions.Configuration/IConfiguration.xml

The grammar is resolved

Co-authored-by: Eric Erhardt <[email protected]>

Author: electricalArt

xml/Microsoft.Extensions.Configuration/IConfiguration.xml

@@ -116,7 +116,7 @@
         <remarks>This method will never return <see langword="null" />. If no matching sub-section is found with the specified key,
                 an empty <see cref="T:Microsoft.Extensions.Configuration.IConfigurationSection" /> will be returned.
 
-                You can reach sub-subsection by passing "section1:section2:section.." as key parameter</remarks>
+                You can reach a sub-subsection by passing "section1:section2:section.." for <paramref name="key"/>.</remarks>
       </Docs>
     </Member>
     <Member MemberName="Item">