Fix typo in documentation

doc/bruteforce-protection.markdown

@@ -1,14 +1,14 @@
-Bruteforce Protection
-=====================
+Brute Force Protection
+======================
 
 The brute force protection of Kanboard works at the user account level:
 
-- After 3 authentication failure for the same username, the login form show a captcha image to prevent automated bot tentatives.
+- After 3 authentication failure for the same username, the login form shows a captcha image to prevent automated bot tentatives.
 - After 6 authentication failure, the user account is locked down for a period of 15 minutes.
 
 This feature works only for authentication methods that use the login form.
 
-However, **after 3 authentication failure through the user API**, the account have to be unlocked by using the login form.
+However, **after three authentication failure through the user API**, the account has to be unlocked by using the login form.
 
 Kanboard doesn't block any IP addresses since bots can use several anonymous proxies. However, you can use external tools like [fail2ban](http://www.fail2ban.org) to avoid massive scans.
 
@@ -21,6 +21,6 @@ define('BRUTEFORCE_CAPTCHA', 3);
 // Lock the account after 6 authentication failure
 define('BRUTEFORCE_LOCKDOWN', 6);
 
-// Lock account duration in minute
+// Lock account duration in minutes
 define('BRUTEFORCE_LOCKDOWN_DURATION', 15);
 ```