Update xml/System.Runtime.InteropServices/DllImportResolver.xml

Co-authored-by: Genevieve Warren <[email protected]>

Author: gfoidl

xml/System.Runtime.InteropServices/DllImportResolver.xml

@@ -39,7 +39,7 @@
 
 The runtime does not do any lifetime management around the handle returned by a <xref:System.Runtime.InteropServices.DllImportResolver>. It is left to the implementation and consuming code to keep the library loaded for as long as necessary and free it if/when desired. 
 
-For each entry point the resolver is called the first time PInvoke is done. As long as the library is not unloaded via <xref:System.Runtime.InteropServices.NativeLibrary.Free> it is safe to have a cache for libraryname to handle mapping.
+For each entry point, the resolver is called the first time PInvoke is used. As long as the library isn't unloaded via <xref:System.Runtime.InteropServices.NativeLibrary.Free>, it's safe to have a cache for `libraryname` to handle mapping.
 
       ]]></format>
     </remarks>