Minor grammar corrections in example's README

Author: erovira

examples/database_blacklist/README.md

@@ -1,5 +1,5 @@
 # Blacklist with a database
-Database are a common choice for storing blacklist tokens. It has many
+A database is a common choice for storing blacklisted tokens. It has many
 benefits over an in memory store, like redis. The most obvious benefit of
 using a database is data consistency. If you add something to the database,
 you don't need to worry about it vanishing in an event like a power outage.
@@ -15,9 +15,9 @@ Databases also have some cons compared to an in memory store, namely that
 they are potentially slower, and they may grow huge over time and need to be
 manually pruned back down.
 
-This project contains example code for you you might implement a blacklist
+This project contains example code for you to implement a blacklist
 using a database, with some more complex features that might benefit your
-application. For ease of use, we will use flask-sqlalchey with an in
+application. For ease of use, we will use flask-sqlalchemy with an in
 memory data store, but in production I would highly recommend using postgres.
 Please note that this code is only an example, and although I do my best to
-insure its quality, it has not been thoroughly tested.
+ensure its quality, it has not been thoroughly tested.