add references

REFERENCE.md

@@ -229,6 +229,8 @@ The following parameters are available in the `nginx` class:
 * [`geo_mappings_defaults`](#geo_mappings_defaults)
 * [`string_mappings`](#string_mappings)
 * [`string_mappings_defaults`](#string_mappings_defaults)
+* [`nginx_snippets`](#nginx_snippets)
+* [`nginx_snippets_defaults`](#nginx_snippets_defaults)
 * [`nginx_locations`](#nginx_locations)
 * [`nginx_locations_defaults`](#nginx_locations_defaults)
 * [`nginx_mailhosts`](#nginx_mailhosts)
@@ -1518,6 +1520,22 @@ Data type: `Hash`
 
 
 
+Default value: `{}`
+
+##### <a name="nginx_snippets"></a>`nginx_snippets`
+
+Data type: `Hash`
+
+
+
+Default value: `{}`
+
+##### <a name="nginx_snippets_defaults"></a>`nginx_snippets_defaults`
+
+Data type: `Hash`
+
+
+
 Default value: `{}`
 
 ##### <a name="nginx_locations"></a>`nginx_locations`
@@ -3221,6 +3239,7 @@ The following parameters are available in the `nginx::resource::server` defined
 * [`use_default_location`](#use_default_location)
 * [`rewrite_rules`](#rewrite_rules)
 * [`string_mappings`](#string_mappings)
+* [`nginx_snippets`](#nginx_snippets)
 * [`geo_mappings`](#geo_mappings)
 
 ##### <a name="ensure"></a>`ensure`
@@ -4298,6 +4317,14 @@ Data type: `Any`
 
 
 
+Default value: `{}`
+
+##### <a name="nginx_snippets"></a>`nginx_snippets`
+
+Data type: `Any`
+
+
+
 Default value: `{}`
 
 ##### <a name="geo_mappings"></a>`geo_mappings`