Clarify the news entry

nirs · nirs · commit 4da81693a4e7 · 2017-12-01T00:45:52.000+02:00
- Mention the impacted methods and the GIL (Victor)
diff --git a/Misc/NEWS.d/next/Library/2017-11-30-20-38-16.bpo-32186.O42bVe.rst b/Misc/NEWS.d/next/Library/2017-11-30-20-38-16.bpo-32186.O42bVe.rst
@@ -1,3 +1,3 @@
-Fixed hang of all threads when using io.FileIO with inaccessible NFS server.
-Now only the thread accessing the problematic storage will hang.  Patch by
-Nir Soffer.
+io.FileIO.readall() and io.FileIO.read() now release the GIL when
+getting the file size. Fixed hang of all threads with inaccessible NFS
+server.  Patch by Nir Soffer.
