Use non-redundant ids in password4j docs

Documentation ids no longer need to be globally unique, so they
do not need to include the path. This makes the ids less verbose and
integrates with include-code extension better.

Issue gh-17706

Author: rwinch

docs/modules/ROOT/pages/features/authentication/password-storage.adoc

@@ -463,7 +463,7 @@ There are a significant number of other `PasswordEncoder` implementations that e
 They are all deprecated to indicate that they are no longer considered secure.
 However, there are no plans to remove them, since it is difficult to migrate existing legacy systems.
 
-[[authentication-password-storage-password4j]]
+[[password4j]]
 == Password4j-based Password Encoders
 
 Spring Security 7.0 introduces alternative password encoder implementations based on the https://github.com/Password4j/password4j[Password4j] library.
@@ -474,7 +474,7 @@ These encoders are particularly useful when you need specific algorithm configur
 
 All Password4j-based encoders are thread-safe and can be shared across multiple threads.
 
-[[authentication-password-storage-password4j-argon2]]
+[[password4j-argon2]]
 === Argon2Password4jPasswordEncoder
 
 The `Argon2Password4jPasswordEncoder` implementation uses the https://en.wikipedia.org/wiki/Argon2[Argon2] algorithm via the Password4j library to hash passwords.
@@ -515,7 +515,7 @@ val customEncoder = Argon2Password4jPasswordEncoder(customArgon2)
 ----
 ======
 
-[[authentication-password-storage-password4j-bcrypt]]
+[[password4j-bcrypt]]
 === BcryptPassword4jPasswordEncoder
 
 The `BcryptPassword4jPasswordEncoder` implementation uses the https://en.wikipedia.org/wiki/Bcrypt[BCrypt] algorithm via the Password4j library to hash passwords.
@@ -556,7 +556,7 @@ val customEncoder = BcryptPassword4jPasswordEncoder(customBcrypt)
 ----
 ======
 
-[[authentication-password-storage-password4j-scrypt]]
+[[password4j-scrypt]]
 === ScryptPassword4jPasswordEncoder
 
 The `ScryptPassword4jPasswordEncoder` implementation uses the https://en.wikipedia.org/wiki/Scrypt[SCrypt] algorithm via the Password4j library to hash passwords.
@@ -597,7 +597,7 @@ val customEncoder = ScryptPassword4jPasswordEncoder(customScrypt)
 ----
 ======
 
-[[authentication-password-storage-password4j-pbkdf2]]
+[[password4j-pbkdf2]]
 === Pbkdf2Password4jPasswordEncoder
 
 The `Pbkdf2Password4jPasswordEncoder` implementation uses the https://en.wikipedia.org/wiki/PBKDF2[PBKDF2] algorithm via the Password4j library to hash passwords.
@@ -639,7 +639,7 @@ val customEncoder = Pbkdf2Password4jPasswordEncoder(customPbkdf2, 32)
 ----
 ======
 
-[[authentication-password-storage-password4j-balloon]]
+[[password4j-ballooning]]
 === BalloonHashingPassword4jPasswordEncoder
 
 The `BalloonHashingPassword4jPasswordEncoder` implementation uses the Balloon hashing algorithm via the Password4j library to hash passwords.

docs/modules/ROOT/pages/whats-new.adoc

@@ -38,11 +38,11 @@ http.csrf((csrf) -> csrf.spa());
 == Crypto
 
 * Added Password4j-based password encoders providing alternative implementations for popular hashing algorithms:
-** `Argon2Password4jPasswordEncoder` - xref:features/authentication/password-storage.adoc#authentication-password-storage-password4j-argon2[Argon2 implementation using Password4j]
-** `BcryptPassword4jPasswordEncoder` - xref:features/authentication/password-storage.adoc#authentication-password-storage-password4j-bcrypt[BCrypt implementation using Password4j]
-** `ScryptPassword4jPasswordEncoder` - xref:features/authentication/password-storage.adoc#authentication-password-storage-password4j-scrypt[SCrypt implementation using Password4j]
-** `Pbkdf2Password4jPasswordEncoder` - xref:features/authentication/password-storage.adoc#authentication-password-storage-password4j-pbkdf2[PBKDF2 implementation using Password4j]
-** `BalloonHashingPassword4jPasswordEncoder` - xref:features/authentication/password-storage.adoc#authentication-password-storage-password4j-balloon[Balloon Hashing implementation using Password4j]
+** `Argon2Password4jPasswordEncoder` - xref:features/authentication/password-storage.adoc#password4j-argon2[Argon2]
+** `BcryptPassword4jPasswordEncoder` - xref:features/authentication/password-storage.adoc#password4j-bcrypt[BCrypt]
+** `ScryptPassword4jPasswordEncoder` - xref:features/authentication/password-storage.adoc#password4j-scrypt[SCrypt]
+** `Pbkdf2Password4jPasswordEncoder` - xref:features/authentication/password-storage.adoc#password4j-pbkdf2[PBKDF2]
+** `BalloonHashingPassword4jPasswordEncoder` - xref:features/authentication/password-storage.adoc#password4j-balloon[Balloon Hashing]
 
 == Data