Clarify across several reference entries that children can take either a pool list or a set name.

Author: jmacdotorg

content/features/proxy/reference.md

@@ -29,9 +29,15 @@ result that it received.
 
 ```lua
 route_allsync{
-    children = { "{{<var>}}POOL_NAME{{</var>}}", [ ... ] }
+    children = {{<var>}}POOL_LIST_OR_SET_NAME{{</var>}}
 }
 ```
+Replace <var>POOL_LIST_OR_SET_NAME</var> with either one of the following:
+
+* A bracketed, comma-separated list of of pool names defined in the `pools{}` block of your configuration file—for example, `{ "cust_pool_1", "cust_pool_2" }`.
+
+* The name of a set defined in the `pools{}` block of your configuration file—for example, `"set_cust_pools"`.
+
 
 ### `route_allfastest`
 
@@ -41,10 +47,16 @@ The proxy returns the first response that it receives from any pool.
 
 ```lua
 route_allfastest{
-    children = { "{{<var>}}POOL_NAME{{</var>}}", [ ... ] }
+    children = {{<var>}}POOL_LIST_OR_SET_NAME{{</var>}}
 }
 ```
 
+Replace <var>POOL_LIST_OR_SET_NAME</var> with either one of the following:
+
+* A bracketed, comma-separated list of of pool names defined in the `pools{}` block of your configuration file—for example, `{ "cust_pool_1", "cust_pool_2" }`.
+
+* The name of a set defined in the `pools{}` block of your configuration file—for example, `"set_cust_pools"`.
+
 ### `route_split`
 
 Routes a request to exactly two pools.
@@ -81,7 +93,7 @@ Routes the request to a list of pools, serially. You can tune the behavior of th
 
 ```lua
 route_failover{
-    children = { "{{<var>}}POOL_NAME{{</var>}}", [ ... ] },
+    children = {{<var>}}POOL_LIST_OR_SET_NAME{{</var>}},
     failover_count = {{<var>}}FAILOVER_COUNT{{</var>}},
     shuffle = {{<var>}}SHUFFLE_BOOLEAN{{</var>}},
     miss = {{<var>}}MISS_BOOLEAN{{</var>}},
@@ -90,7 +102,9 @@ route_failover{
 
 Replace the following:
 
-* <var>POOL_NAME</var>: the name of a pool defined in the `pools{}` block of your configuration file.
+* <var>POOL_LIST_OR_SET_NAME</var>: either one of the following:
+    * A bracketed, comma-separated list of of pool names defined in the `pools{}` block of your configuration file—for example, `{ "cust_pool_1", "cust_pool_2" }`.
+    * The name of a set defined in the `pools{}` block of your configuration file—for example, `"set_cust_pools"`.
 * <var>FAILOVER_COUNT</var>: the number of failures that the proxy receives from a pool before fails over to the next pool in the list.
 * <var>SHUFFLE_BOOLEAN</var>: if true, then the proxy randomizes the list of pools before routing the request. Otherwise, uses the list of pools in the given order.
 * <var>MISS_BOOLEAN</var>: if true, then the proxy treats both misses and errors as failures. Otherwise, the proxy counts only errors as failures.