fix fields issue (#3434)

Author: Guaris

app/_includes/plugins/logging/log-custom-fields-by-lua.md

@@ -42,20 +42,20 @@ The field will look like this in the log:
 
 All logging plugins use the same table for logging. 
 If you set `custom_fields_by_lua` in one plugin, all logging plugins that execute after that plugin will also use the same configuration. 
-For example, if you configure fields via `custom_fields_by_lua` in {% unless page.name =="Syslog" %}{{page.name}}{% else %}[File Log](/plugins/file-log/){% endunless %}, those same fields will appear in [Syslog](/plugins/syslog/), since {{page.name}} executes first.
+For example, if you configure fields via `custom_fields_by_lua` in File log those same fields will appear in [Syslog](/plugins/syslog/), since {{page.name}} executes first.
 
-If you want all logging plugins to use the same configuration, we recommend using the [Pre-function](/plugins/pre-function/) plugin to call [kong.log.set_serialize_value](/gateway/pdk/reference/kong.log/#kong-log-set-serialize-value-key-value-options) so that the function is applied predictably and is easier to manage.
+* If you want all logging plugins to use the same configuration, we recommend using the [Pre-function](/plugins/pre-function/) plugin to call [kong.log.set_serialize_value](/gateway/pdk/reference/kong.log/#kong-log-set-serialize-value-key-value-options) so that the function is applied predictably and is easier to manage.
 
 If you **don't** want all logging plugins to use the same configuration, you need to manually disable the relevant fields in each plugin. 
 
-For example, if you configure a field in File Log that you don't want appearing in {{include.name}}, set that field to `return nil` in the {{include.name}} plugin:
+* For example, if you configure a field in File Log that you don't want appearing in Syslog, set that field to `return nil` in the File Log plugin:
 
-```sh
-curl -i -X POST http://localhost:8001/plugins/ \
-...
-  --data config.name={{include.slug}} \
-  --data {{custom_fields_by_lua}}.my_file_log_field="return nil"
-```
+  ```sh
+  curl -i -X POST http://localhost:8001/plugins/ \
+  ...
+    --data config.name={{include.slug}} \
+    --data {{custom_fields_by_lua}}.my_file_log_field="return nil"
+  ```
 
 See the [plugin execution order reference](/gateway/entities/plugin/#plugin-contexts) for more details on plugin ordering.