Update builders index page (#11765)

- Fix broken link thanks
- Update language text

website/content/docs/builders/index.mdx

@@ -11,12 +11,12 @@ Builders create machines and generate images from those machines for various pla
 
 Packer has the following types of builders:
 
-- [Plugin](/plugin): Each plugin has its own associated set of builders. For example, there are separate builders for EC2, VMware, VirtualBox, etc.
+- [Plugin](/plugins): Each plugin has its own associated set of builders. For example, there are separate builders for EC2, VMware, VirtualBox, etc.
 - [File](/docs/builders/file): The `file` builder creates an artifact from a file.
 - [Null](/docs/builders/null): The `null` builder sets up an SSH connection and runs the provisioners.
 - [Custom](/docs/plugins/creation/custom-builders): You can write new builders for new or existing platforms.
 - [Community-Supported](/docs/builders/community-supported): The Packer community develops and maintains builders for several additional platforms.
 
-Refer to the [`source`](/docs/templates/hcl_templates/blocks/source) block documentation to learn more about configuring builders in the Packer language.
+Refer to the [`source`](/docs/templates/hcl_templates/blocks/source) block documentation to learn more about configuring builders in the Packer templating language.