Typo fix and sentence cleanup in post-commit script.

BitKeeper/triggers/post-commit

@@ -47,8 +47,9 @@ To: $INTERNALS
 Subject: bk commit into 4.0 tree
 
 Below is the list of changes that have just been committed into a
-4.0 repository of $USER. When $USER does a push, they will be propogated to 
-the main repository and within 24 hours after the push to the public repository. 
+4.0 repository of $USER. When $USER does a push these changes will
+be propagated to the main repository and, within 24 hours after the
+push, to the public repository.
 For information on how to access the public repository
 see http://www.mysql.com/doc/I/n/Installing_source_tree.html