Update migration guide for 6.0 breaking changes

Removed the section about all deprecated elements in 5.x, as things like id have been retained.

Author: StephenCathcart

MIGRATION_GUIDE.md

@@ -415,8 +415,6 @@ returned.
 
 ### 5.x deprecation removals
 
-Every deprecated element in 5.x has been removed from 6.0. This includes:
-
 #### Structs
 * `neo4j.Config` (replaced by `config.Config` since 5.8.0)
 
@@ -454,4 +452,4 @@ The `*WithContext` APIs are now deprecated in v6 and will be removed in v7.0. Th
 
 The minimum Go version requirement has been updated to Go 1.24 for v6.0.
 
-For a complete list of all breaking changes, see the [planned breaking changes discussion](https://github.com/neo4j/neo4j-go-driver/discussions/456).
+For a complete list of all breaking changes, see the [planned breaking changes discussion](https://github.com/neo4j/neo4j-go-driver/discussions/456).