Add missing closing parenthesis (#11599)

* Add missing closing parenthesis

Signed-off-by: Johanan Liebermann <jliebermann@microsoft.com>
Co-authored-by: Adrien Delorme <azr@users.noreply.github.com>

website/content/docs/commands/validate.mdx

@@ -42,7 +42,7 @@ Errors validating build 'vmware'. 1 error(s) occurred:
 - `-only=foo,bar,baz` - Only validate the builds with the given comma-separated
   names. In legacy JSON templates, build names default to the
   types of their builders (e.g. `docker` or
-  `amazon-ebs` or `virtualbox-iso`, unless a specific `name` attribute is
+  `amazon-ebs` or `virtualbox-iso`), unless a specific `name` attribute is
   specified within the configuration. In HCL2 templates, the "name" is the
   source block's "name" label, unless an in-build source definition adds the
   "name" configuration option.

website/content/docs/templates/legacy_json_templates/post-processors.mdx

@@ -171,5 +171,5 @@ option _ignores_ post-processors.
 The values within `only` or `except` are _build names_, not builder types.
 Name is a required block label in HCL, but in legacy JSON, build names default
 to the types of their builders (e.g. `docker` or `amazon-ebs` or
-`virtualbox-iso`, unless a specific `name` attribute is specified within the
+`virtualbox-iso`), unless a specific `name` attribute is specified within the
 configuration.