Update and document mbedtls extensions

Signed-off-by: Archana <archana.madhavan@silabs.com>
Signed-off-by: Asfandyar Orakzai <asfandyar.orakzai@silabs.com>
diff --git a/scripts/data_files/driver_templates/OS-template-opaque.jinja b/scripts/data_files/driver_templates/OS-template-opaque.jinja
index 115e22c..a25d1c3 100644
--- a/scripts/data_files/driver_templates/OS-template-opaque.jinja
+++ b/scripts/data_files/driver_templates/OS-template-opaque.jinja
@@ -7,7 +7,7 @@
 -#}
 {% for driver in drivers if driver.type == "opaque" -%}
 {% for capability in driver.capabilities if entry_point in capability.entry_points -%}
-#if ({% if capability['mbedtls/c_depend_on'] is defined -%}{{ capability['mbedtls/c_depend_on'] }} {% else -%} {{ 1 }} {% endif %})
+#if ({% if capability['mbedtls/c_condition'] is defined -%}{{ capability['mbedtls/c_condition'] }} {% else -%} {{ 1 }} {% endif %})
 {%- filter indent(width = nest_indent) %}
 case {{ driver.location }}:
     return( {{ entry_point_name(capability, entry_point, driver) }}({{entry_point_param(driver) | indent(20)}}));