chore: clarify wording

Co-authored-by: Liam Cervante <liam.cervante@hashicorp.com>

website/docs/cli/commands/providers/lock.mdx

@@ -90,10 +90,9 @@ You can customize the default behavior using the following additional option:
 
 * `-enable-plugin-cache` -  Enable the usage of the [globally configured plugin cache](/terraform/cli/config/config-file#provider-plugin-cache).
   This will speed up the locking process. This is not enabled by default since
-  the providers won't be loaded from an authoritative source. As the
+  the the plugin cache is not an authoritative source. As the
   `terraform provider lock` command is used to ensure no untrusted provider
-  versions can be used, e.g. by adding them to the plugin cache or a mirror
-  installing the plugins from cache is potentially risky.
+  versions can be used installing the plugins from the cache is considered risky.
 
 
 ## Specifying Target Platforms