Add sample json, and add empty hash in json to make it valid

.github/forced-tests-list.json

@@ -0,0 +1,3 @@
+{
+
+}

.github/forced-tests-list.json.sample

@@ -0,0 +1,11 @@
+{
+  "DEFAULT":
+    [
+      "tests/appsec/waf/test_miscs.py::Test_CorrectOptionProcessing",
+      "tests/test_semantic_conventions.py::Test_Meta::test_meta_span_kind"
+    ],
+  "APPSEC_STANDALONE":
+    [
+      "tests/appsec/test_asm_standalone.py"
+    ]
+}

docs/ForcingSystemTests.md

@@ -22,7 +22,7 @@ To do so, you can complete the `.github/forced-tests-list.json` file by followin
 ## Example
 
 ```json
-  {
+{
   "DEFAULT":
     [
       "tests/appsec/waf/test_miscs.py::Test_CorrectOptionProcessing",
@@ -37,4 +37,8 @@ To do so, you can complete the `.github/forced-tests-list.json` file by followin
 
 ## Cleanup
 
-You can leave other force-executed tests added by other developers and append yours to the .json file, there is a cleanup task in the release process.
+You can leave other force-executed tests added by other developers and append yours to the .json file, there is a cleanup task in the release process.
+
+## Reference
+
+System-tests documentation on [force-executing tests](https://github.com/DataDog/system-tests/blob/main/docs/execute/force-execute.md)