rename TPR to CRD

docs/chart_best_practices/third_party_resources.md → docs/chart_best_practices/custom_resource_definitions.md

-# Third Party Resources
+# Custom Resource Definitions
 
-This section of the Best Practices Guide deals with creating and using Third Party Resource
+This section of the Best Practices Guide deals with creating and using Custom Resource Definition
 objects.
 
-When working with Third Party Resources (TPRs), it is important to distinguish
+When working with Custom Resource Definitions (CRDs), it is important to distinguish
 two different pieces:
 
-- There is a declaration of a TPR. This is the YAML file that has the kind `ThirdPartyResource`
-- Then there are resources that _use_ the TPR. Say a TPR defines `foo.example.com/v1`. Any resource
-  that has `apiVersion: example.com/v1` and kind `Foo` is a resource that uses the
-  TPR.
+- There is a declaration of a CRD. This is the YAML file that has the kind `CustomResourceDefinition`
+- Then there are resources that _use_ the CRD. Say a CRD defines `foo.example.com/v1`. Any resource
+  that has `apiVersion: example.com/v1` and kind `Foo` is a resource that uses the CRD.
 
-## Install a TPR Declaration Before Using the Resource
+## Install a CRD Declaration Before Using the Resource
 
 Helm is optimized to load as many resources into Kubernetes as fast as possible.
 By design, Kubernetes can take an entire set of manifests and bring them all
 online (this is called the reconciliation loop).
 
-But there's a difference with TPRs.
+But there's a difference with CRDs.
 
-For a TPR, the declaration must be registered before any resources of that TPRs
+For a CRD, the declaration must be registered before any resources of that CRDs
 kind(s) can be used. And the registration process sometimes takes a few seconds.
 
 ### Method 1: Separate Charts
 
-One way to do this is to put the TPR definition in one chart, and then put any
-resources that use that TPR in _another_ chart.
+One way to do this is to put the CRD definition in one chart, and then put any
+resources that use that CRD in _another_ chart.
 
 In this method, each chart must be installed separately.
 
 ### Method 2: Pre-install Hooks
 
-To package the two together, add a `pre-install` hook to the TPR definition so
+To package the two together, add a `pre-install` hook to the CRD definition so
 that it is fully installed before the rest of the chart is executed.
 
-Note that if you create the TPR with a `pre-install` hook, that TPR definition
+Note that if you create the CRD with a `pre-install` hook, that CRD definition
 will not be deleted when `helm delete` is run.