darwinosl: added deprecated option parts

Signed-off-by: Hofi <hofione@gmail.com>

Author: HofiOne

_includes/doc/admin-guide/options/deprecated-options.md

@@ -0,0 +1,2 @@
+**NOTE:** The deprecated `{{ include.old }}()` option is an alias for the `{{ include.new }}()` option, retained for compatibility with earlier {{ site.product.short_name }} versions, but it may be removed at any time without further notice!
+{: .notice--info}

_includes/doc/admin-guide/options/log-fetch-delays.md

@@ -8,9 +8,13 @@
 **NOTE:** Increasing the value of this parameter (which lowers delay time) can increase log feed performance, but at could increase system load.
 {: .notice--info}
 
+{% include doc/admin-guide/options/deprecated-options.md old='fetch-delay' new='log-fetch-delay' %}
+
 ## log-fetch-retry-delay()
 
 |Type:|     integer|
 |Default:| `1`|
 
 *Description:* Controls how many seconds {{ site.product.short_name }} spends idle before checking for new logs, in case no new logs were read the last time.
+
+{% include doc/admin-guide/options/deprecated-options.md old='fetch-retry-delay' new='log-fetch-retry-delay' %}