remove note about RC1 and the like, we handle them now...

README.md

@@ -41,19 +41,17 @@ most snapshots from 2015 and before.  The tool could be updated to include
 SHA256, but not a priority currently, and most/all are not available for
 download.
 
-NOTE: Not all of the snapshots are in the database.  Some snapshot names,
-like 11.0-RC1, don't contain all the info others do, and are not
-included.  In the future, hopefully this will be fixed.
-
 backend
 -------
 
-The backend is just a simple text file the indexes all the published
+The backend is just a simple text file which indexes all the published
 snapshots.  It is built from the emails to the freebsd-snapshot
 list.  After verification of the email's signature, the SHA512 entry
 lines are extracted, the file name is parsed, and added to the complete
 index.  The message-id of the email is in the index so that the frontend
-can d/l the original email, verify the GPG signature locally.  The
+can d/l the original email and verify the GPG signature locally.  The
 complete index is used for verifying a snapshot that has already been
 downloaded.  Another index is also maintained which only contains the
-currently available to d/l snapshots. 
+currently available to d/l snapshots.  This may contain snapshots that
+no longer exist, as it is only updated/checked when a new snapshot is
+released.