Fix typos in app.ini (#2732)

conf/app.ini

@@ -240,7 +240,7 @@ ENABLE_OPENID_SIGNIN = true
 ; Example value: trusted.domain.org trusted.domain.net
 WHITELISTED_URIS =
 ; Forbidden URI patterns (POSIX regexp).
-; Space sepaated.
+; Space separated.
 ; Only used if WHITELISTED_URIS is blank.
 ; Example value: loadaverage.org/badguy stackexchange.com/.*spammer
 BLACKLISTED_URIS =
@@ -320,7 +320,7 @@ PASSWD =
 SEND_AS_PLAIN_TEXT = false
 ; Enable sendmail (override SMTP)
 USE_SENDMAIL = false
-; Specifiy an alternative sendmail binary
+; Specify an alternative sendmail binary
 SENDMAIL_PATH = sendmail
 
 [cache]
@@ -362,7 +362,7 @@ GRAVATAR_SOURCE = gravatar
 DISABLE_GRAVATAR = false
 ; Federated avatar lookup uses DNS to discover avatar associated
 ; with emails, see https://www.libravatar.org
-; This value will be forced to be false in offline mode or Gravatar is disbaled.
+; This value will be forced to be false in offline mode or Gravatar is disabled.
 ENABLE_FEDERATED_AVATAR = false
 
 [attachment]
@@ -378,7 +378,7 @@ MAX_SIZE = 4
 MAX_FILES = 5
 
 [time]
-; Specifies the format for fully outputed dates. Defaults to RFC1123
+; Specifies the format for fully outputted dates. Defaults to RFC1123
 ; Special supported values are ANSIC, UnixDate, RubyDate, RFC822, RFC822Z, RFC850, RFC1123, RFC1123Z, RFC3339, RFC3339Nano, Kitchen, Stamp, StampMilli, StampMicro and StampNano
 ; For more information about the format see http://golang.org/pkg/time/#pkg-constants
 FORMAT =
@@ -476,7 +476,7 @@ OLDER_THAN = 24h
 
 ; Synchronize external user data (only LDAP user synchronization is supported)
 [cron.sync_external_users]
-; Syncronize external user data when starting server (default false)
+; Synchronize external user data when starting server (default false)
 RUN_AT_START = false
 ; Interval as a duration between each synchronization (default every 24h)
 SCHEDULE = @every 24h