Polish reference

docs/manual/src/docs/asciidoc/_includes/password-encoder.adoc

@@ -45,7 +45,7 @@ https://en.wikipedia.org/wiki/PBKDF2[PBKDF2],
 https://en.wikipedia.org/wiki/Scrypt[scrypt],
 and https://en.wikipedia.org/wiki/Argon2[Argon2].
 
-Because adaptive one-way functions are intentionally resource intensive, validating a username and password for every request will degrade performance of an application significantly
+Because adaptive one-way functions are intentionally resource intensive, validating a username and password for every request will degrade performance of an application significantly.
 There is nothing Spring Security (or any other library) can do to speed up the validation of the password since security is gained by making the validation resource intensive.
 Users are encouraged to exchange the long term credentials (i.e. username and password) for a short term credential (i.e. session, OAuth Token, etc).
 The short term credential can be validated quickly without any loss in security.