chore: bump version to 1.2.0-beta and fix docstring

Author: ocots

src/helpers/descriptive_routing.jl

@@ -97,7 +97,7 @@ julia> length(defs)
 julia> defs[1].name
 :initial_guess
 julia> defs[1].aliases
-(:init, :i)
+(:init,)
 ```
 
 See also: [`_route_descriptive_options`](@ref)

src/helpers/kwarg_extraction.jl

@@ -63,7 +63,7 @@ Raises an error if more than one alias is present simultaneously.
 # Examples
 ```julia
 julia> kw = pairs((; init=x0, display=false))
-julia> val, rest = OptimalControl._extract_action_kwarg(kw, (:initial_guess, :init, :i), nothing)
+julia> val, rest = OptimalControl._extract_action_kwarg(kw, (:initial_guess, :init), nothing)
 julia> val === x0
 true
 ```