docs: update READMEs of transactional plugins

packages/transactional-adapters/transactional-adapter-knex/README.md

@@ -2,4 +2,4 @@
 
 Knex adapter for the `@nestjs-cls/transactional` plugin.
 
-### ➡️ [Go to the documentation website](https://papooch.github.io/nestjs-cls/plugins/available-plugins/transactional) 📖
+### ➡️ [Go to the documentation website](https://papooch.github.io/nestjs-cls/plugins/available-plugins/transactional/knex-adapter) 📖

packages/transactional-adapters/transactional-adapter-prisma/README.md

@@ -2,4 +2,4 @@
 
 Prisma adapter for the `@nestjs-cls/transactional` plugin.
 
-### ➡️ [Go to the documentation website](https://papooch.github.io/nestjs-cls/plugins/available-plugins/transactional) 📖
+### ➡️ [Go to the documentation website](https://papooch.github.io/nestjs-cls/plugins/available-plugins/transactional/prisma-adapter) 📖

packages/transactional/README.md

@@ -1,5 +1,9 @@
 # @nestjs-cls/transactional
 
-Transactional plugin for the `nestjs-cls`
+A "Transactional" plugin for nestjs-cls that provides a generic interface that can be used to wrap any function call in a CLS-enabled transaction by storing the transaction reference in the CLS context.
 
-### ➡️ [Go to the documentation website](https://papooch.github.io/nestjs-cls/plugins) 📖
+The transaction reference can be then retrieved in any other service and refer to the same transaction without having to pass it around.
+
+The plugin is designed to be database-agnostic and can be used with any database library that supports transactions (via adapters). At the expense of using a minimal wrapper, it deliberately does not require any monkey-patching of the underlying library.
+
+### ➡️ [Go to the documentation website](https://papooch.github.io/nestjs-cls/plugins/available-plugins/transactional) 📖