Update tags_tag_key.html.markdown (#7743) (#5504)

Update parent field to include projects now that they're supported.

Signed-off-by: Modular Magician <[email protected]>

Author: modular-magician

.changelog/7743.txt

@@ -0,0 +1,3 @@
+```release-note:enhancement
+updated the docs for project parented tags.
+```

website/docs/d/tags_tag_key.html.markdown

@@ -1,12 +1,12 @@
 ---
 subcategory: "Tags"
 description: |-
-  Get a tag key within a GCP organization.
+  Get a tag key within a GCP organization or project.
 ---
 
 # google\_tags\_tag\_key
 
-Get a tag key within a GCP org by `parent` and `short_name`.
+Get a tag key by org or project `parent` and `short_name`.
 
 ## Example Usage
 
@@ -16,14 +16,20 @@ data "google_tags_tag_key" "environment_tag_key"{
   short_name = "environment"
 }
 ```
+```tf
+data "google_tags_tag_key" "environment_tag_key"{
+  parent = "projects/abc"
+  short_name = "environment"
+}
+```
 
 ## Argument Reference
 
 The following arguments are supported:
 
 * `short_name` - (Required) The tag key's short_name.
 
-* `parent` - (Required) The resource name of the parent organization in format `organizations/{org_id}`.
+* `parent` - (Required) The resource name of the parent organization or project. It can be in format `organizations/{org_id}` or `projects/{project_id_or_number}`.
 
 ## Attributes Reference
 
@@ -35,7 +41,7 @@ In addition to the arguments listed above, the following attributes are exported
   The generated numeric id for the TagKey.
 
 * `namespaced_name` -
-  Namespaced name of the TagKey.
+  Namespaced name of the TagKey which is in the format `{parentNamespace}/{shortName}`.
 
 * `create_time` -
   Creation time.