Adjusted documentation

Author: JohannesRabauer

docs/modules/ROOT/nav.adoc

@@ -2,7 +2,9 @@
 * xref:installation.adoc[Installation]
 * xref:configuration.adoc[Configuration]
 * xref:working-copies.adoc[Working Copies]
-* xref:lazies.adoc[Lazy References]
-* xref:transactions.adoc[Transactions]
+* xref:features/features.adoc[Features]
+** xref:features/lazies.adoc[Lazy References]
+** xref:features/transactions.adoc[Transactions]
+** xref:features/versions.adoc[Versions]
 * xref:migration.adoc[Migration]
 * xref:known-issues.adoc[Known issues]

docs/modules/ROOT/pages/features/features.adoc

@@ -0,0 +1,5 @@
+= Features
+
+* xref:features/lazies.adoc[Lazy References]
+* xref:features/transactions.adoc[Transactions]
+* xref:features/versions.adoc[Versions]

docs/modules/ROOT/pages/lazies.adoc renamed to docs/modules/ROOT/pages/features/lazies.adoc

@@ -0,0 +1,12 @@
+= Versions
+
+To implement Optimistic Locking {product-name} supports the `@Version` annotation in entities.
+The following types can be used as version:
+
+* `int`
+* `Integer`
+* `long`
+* `Long`
+* `UUID` (will be randomly generated)
+* `String` (UUID will be converted to String)
+