fixed README

Author: dmalan

README.md

@@ -26,7 +26,7 @@ s = cs50.get_string();
 1. Run `sudo su -`.
 1. Run `apt install -y libmysqlclient-dev mysql-server postgresql`.
 1. Run `pip3 install mysqlclient psycopg2-binary`.
-1. In `/etc/mysql/mysql.conf.d/mysqld.conf`, add `skip-grant-tables` under `[mysqld]`.
+1. In `/etc/mysql/mysql.conf.d/mysqld.cnf`, add `skip-grant-tables` under `[mysqld]`.
 1. In `/etc/profile.d/cli.sh`, remove `valgrind` function for now.
 1. Run `service mysql start`.
 1. Run `mysql -e 'CREATE DATABASE IF NOT EXISTS test;'`.
@@ -41,7 +41,7 @@ s = cs50.get_string();
    host    all             all             127.0.0.1/32            trust
    ```
 1. Run `service postgresql start`.
-1. Run `psql -c 'create database test;' -U postgres.
+1. Run `psql -c 'create database test;' -U postgres`.
 1. Run `touch test.db`.
 
 ### Sample Tests