[docs | wiki] Fixed XIN Rules code block rendering by removing indentation

docs/wiki/01_STUDY_PARAMETERS_SETUP/02_Clinical_Instruments/Annexe_A_XIN-Rules.md

@@ -19,28 +19,28 @@ All elements are required if no rule is specified, unless it is part of a group.
 
 - PHP
 
-    ```php
-    $this->XINRegisterRule(
-        "field_name1",
-        array("field_name2{@}=={@}yes|maybe|sure"),
-        "Required." 
-    );
-    ```
+```php
+$this->XINRegisterRule(
+    "field_name1",
+    array("field_name2{@}=={@}yes|maybe|sure"),
+    "Required." 
+);
+```
 - PHP (with grouping)
 
-    ```php
-    $this->XINRegisterRule(
-        "field_name", // field name on which the rule is applied
-        array("field_name{@}=={@}"), // rule
-        "Required.", // message
-        "group_1" // group [if field is a part of a group]
-    );
-    ```
+```php
+$this->XINRegisterRule(
+    "field_name", // field name on which the rule is applied
+    array("field_name{@}=={@}"), // rule
+    "Required.", // message
+    "group_1" // group [if field is a part of a group]
+);
+```
 - LINST
 
-   ```php
-   field_name1{-}Required.{-}field_name2{@}=={@}yes|maybe|sure
-   ```
+```php
+field_name1{-}Required.{-}field_name2{@}=={@}yes|maybe|sure
+```
 
 > _**NOTE:** When adding XIN rules some elements are implicitly added to a group in NDB_BVL_Instrument.class.inc. In consequence, a group name needs to be specified when registering a rule. A group name is necessary for the following elements:_
 > ```php