doc: fix misplaced #[extension-category] for Wasm runtimes (#17078)

Signed-off-by: Takeshi Yoneda <takeshi@tetrate.io>

Mirrored from https://github.com/envoyproxy/envoy @ 97d8d8f70d1e545a0f3462f77fbb96d51e4bf92d

envoy/extensions/wasm/v3/wasm.proto

@@ -77,6 +77,7 @@ message VmConfig {
   // **envoy.wasm.runtime.wasmtime**: `Wasmtime <https://wasmtime.dev/>`_-based WebAssembly runtime.
   // This runtime is not enabled in the official build.
   //
+  // [#extension-category: envoy.wasm.runtime]
   string runtime = 2 [(validate.rules).string = {min_len: 1}];
 
   // The Wasm code that Envoy will execute.
@@ -86,7 +87,6 @@ message VmConfig {
   // (proxy_on_start). `google.protobuf.Struct` is serialized as JSON before
   // passing it to the plugin. `google.protobuf.BytesValue` and
   // `google.protobuf.StringValue` are passed directly without the wrapper.
-  // [#extension-category: envoy.wasm.runtime]
   google.protobuf.Any configuration = 4;
 
   // Allow the wasm file to include pre-compiled code on VMs which support it.