docs(feature_flags): fix incorrect line markers and envelope name (#3792)

Co-authored-by: Ran Isenberg <[email protected]>

Author: ran-isenberg

docs/utilities/feature_flags.md

@@ -178,7 +178,7 @@ You can use `get_enabled_features` method for scenarios where you need a list of
 
 === "getting_all_enabled_features.py"
 
-    ```python hl_lines="2 9 26"
+    ```python hl_lines="4 9 11 28"
     --8<-- "examples/feature_flags/src/getting_all_enabled_features.py"
     ```
 
@@ -472,7 +472,7 @@ For this to work, you need to use a JMESPath expression via the `envelope` param
 
 === "extracting_envelope.py"
 
-    ```python hl_lines="7"
+    ```python hl_lines="10"
     --8<-- "examples/feature_flags/src/extracting_envelope.py"
     ```
 

examples/feature_flags/src/extracting_envelope.py

@@ -6,8 +6,8 @@
 app_config = AppConfigStore(
     environment="dev",
     application="product-catalogue",
-    name="features",
-    envelope="feature_flags",
+    name="feature_flags",
+    envelope="features",
 )
 
 feature_flags = FeatureFlags(store=app_config)