more alias explanation

docs/src/interfaces/Common_Keywords.md

@@ -103,10 +103,10 @@ Note that if a method does not have adaptivity, the following rules apply:
 
   - `alias`: an `AbstractAliasSpecifier` object that holds fields specifying which variables to alias
     when solving. For example, to tell an ODE solver to alias the `u0` array, you can use an `ODEAliases` object, 
-    and the `alias_u0` keyword argument, e.g. `solve(prob,alias = ODEAliases(alias_u0 = true))`. The fields of 
-    every `AbstractAliasSpecifier` default to `nothing`, which tells the solver to use its default behavior. 
+    and the `alias_u0` keyword argument, e.g. `solve(prob,alias = ODEAliases(alias_u0 = true))`. 
     For more information on what can be aliased for each problem type, see the documentation for the `AbstractAliasSpecifier`
-    associated with that problem type. 
+    associated with that problem type. Set to `true` to alias every variable possible, or to `false` to disable aliasing.
+    Defaults to an `AbstractAliasSpecifier` instance with `nothing` for all fields, which tells the solver to use the default behavior.
   - `cache`: pass a solver cache to decrease the construction time. This is not implemented
     for any of the problem interfaces at this moment.