docs: Configure enclave.runtime.path as liberpal-skeleton-v3.so in

skeleton_remote_attestation_with_rune.md.

Only `liberpal-skeleton-v3.so` supports `rune attest` command.
Signed-off-by: NYilin Li <YiLin.Li@linux.alibaba.com>

rune/libenclave/internal/runtime/pal/skeleton/skeleton_remote_attestation_with_rune.md

@@ -7,7 +7,7 @@ This guide will guide you how to use remote attestation based on SGX in skeleton
 - Register a `SPID` and `Subscription Key` of [IAS](https://api.portal.trustedservices.intel.com/EPID-attestation). After the registration, Intel will respond with a SPID which is needed to communicate with IAS.
 
 # Run skeleton bundle with `rune`
-Before using `rune attest` command, you must ensure your skeleton container/bundles(such as skeleton-enclave-container) running by setting `"wait_timeout","100"` of `process.args` in config.json, just like
+Before using `rune attest` command, you must ensure your skeleton container/bundles(such as skeleton-enclave-container) running by setting `"wait_timeout","100"` of `process.args` in config.json as following:
 ```json
 "process": {
 	"args": [
@@ -16,6 +16,15 @@ Before using `rune attest` command, you must ensure your skeleton container/bund
 }
 ```
 
+Only `liberpal-skeleton-v3.so` supports `rune attest` command. So you also need to configure enclave runtime as following:
+```json
+"annotations": {
+      "enclave.type": "intelSgx",
+      "enclave.runtime.path": "/usr/lib/liberpal-skeleton-v3.so",
+      "enclave.runtime.args": "debug"
+}
+```
+
 Then you can run your skeleton containers by typing the following commands:
 
 ```shell