Remove redundant description of finalizers

Remove redundant information about finalizers on the finalizers
page within the "working with objects" section.

The same description of finalizers is imported directly from the
glossary, so previous to this commit a nearly identical paragraph
is repeated.

For reference, the text imported from the glossasry is

> You can use finalizers to control garbage collection of resources.
> For example, you can define a finalizer to clean up related resources
> or infrastructure before the controller deletes the target resource.

while the text being removed in this commit is:

> You can use finalizers to control garbage collection of resources
> by alerting controllers to perform specific cleanup tasks before
> deleting the target resource.

Author: gabrielreid

content/en/docs/concepts/overview/working-with-objects/finalizers.md

@@ -8,10 +8,6 @@ weight: 80
 
 {{<glossary_definition term_id="finalizer" length="long">}}
 
-You can use finalizers to control {{<glossary_tooltip text="garbage collection" term_id="garbage-collection">}}
-of resources by alerting {{<glossary_tooltip text="controllers" term_id="controller">}} to perform specific cleanup tasks before
-deleting the target resource. 
-
 Finalizers don't usually specify the code to execute. Instead, they are
 typically lists of keys on a specific resource similar to annotations.
 Kubernetes specifies some finalizers automatically, but you can also specify