fix config variable name

Author: michalsn

docs/configuration.md

@@ -12,7 +12,7 @@ We will get our copy ready for modifications.
 
 Available options:
 
-- [$expirationTime](#expirationTime)
+- [$expiration](#expiration)
 - [$algorithm](#algorithm)
 - [$expirationKey](#expirationKey)
 - [$signatureKey](#signatureKey)
@@ -21,7 +21,7 @@ Available options:
 - [$redirect](#redirect)
 - [$show404](#show404)
 
-### $expirationTime
+### $expiration
 
 This setting allows us to set a fixed time after which the signed URL will expire.
 It's number of seconds in unix timestamp that will be added to the current date.

docs/filters.md

@@ -39,7 +39,7 @@ By default, this filter will throw `SignedUrlException` when the URL won't be si
 * We can redirect to the previous page
 * Or show 404 page
 
-More info you can find in the Config section.
+More info you can find in the [Configuration](configuration.md) page.
 
 !!! note