[DOCS] Updating migration guide heading. (#68500)
[DOCS] Updating migration guide heading. (#68500)

* [DOCS] Updating migration guide heading.

* Fixed anchor

* Fixed anchor
GlenRSmith/elasticsearch,GlenRSmith/elasticsearch,GlenRSmith/elasticsearch,robin13/elasticsearch,robin13/elasticsearch,GlenRSmith/elasticsearch,robin13/elasticsearch,robin13/elasticsearch,robin13/elasticsearch,GlenRSmith/elasticsearch