message: fix type in lua examples
diff: @@ -66,7 +66,7 @@ A simple example of configuring Lua HTTP filter that contains only :ref:`inline_
  name: envoy.filters.http.lua
  typed_config:
  - "@type": type.googleapis.com/envoy.extensions.filters.http.lua.v3.lua
  + "@type": type.googleapis.com/envoy.extensions.filters.http.lua.v3.Lua
  inline_code: |
  -- Called on the request path.
  function envoy_on_request(request_handle)
  @@ -93,7 +93,7 @@ As a concrete example, given the following Lua filter configuration:
  name: envoy.filters.http.lua
  typed_config:
  - "@type": type.googleapis.com/envoy.extensions.filters.http.lua.v3.lua
  + "@type": type.googleapis.com/envoy.extensions.filters.http.lua.v3.Lua
  inline_code: |
  function envoy_on_request(request_handle)
  -- do something
  