Update website/docs/cli/commands/validate.mdx

Co-authored-by: trujillo-adam <47586768+trujillo-adam@users.noreply.github.com>

website/docs/cli/commands/validate.mdx

@@ -107,7 +107,7 @@ The nested objects in `diagnostics` have the following properties:
 
   Summaries are typically short, single sentences, but can sometimes be longer
   as a result of returning errors from subsystems that are not designed to
-  return full diagnostics, where the entire error message, therefore, becomes the
+  return full diagnostics, where the entire error message becomes the
   summary. In those cases, the summary might include newline characters which
   a renderer should honor when presenting the message visually to a user.