Finish specifying parameter values for Chain module

Lambdas/Lists/Chain/src/README.md

@@ -7,9 +7,10 @@ N/A
 
 #### Expected query parameters:
   - id
-    - Used for 
-    - Valid values:
+    - Used for specifying which chain to retrieve
+    - Valid values: -1,1<n<{num_chains}
     
 #### Inputs and outputs:
   - id = -1: Returns an array if chainIDs (Integers)
   - id = 1<n<{num_chains}: Returns a [Chain object](https://github.com/ClaytonWWilson/Listify/blob/master/Lambdas/Lists/Chain/src/Chain.java) for the chain with chainID=id
+