Make REPL.TerminalMenus and some if its symbols public (#55307)

(cherry picked from commit e38e4db)

Author: GHTaarn

stdlib/REPL/src/REPL.jl

@@ -100,6 +100,8 @@ export
     LineEditREPL,
     StreamREPL
 
+public TerminalMenus
+
 import Base:
     AbstractDisplay,
     display,

stdlib/REPL/src/TerminalMenus/TerminalMenus.jl

@@ -1,5 +1,12 @@
 # This file is a part of Julia. License is MIT: https://julialang.org/license
 
+"""
+    REPL.TerminalMenus
+
+A module that contains code for displaying text mode interactive menus.
+Key exported symbols include [`REPL.TerminalMenus.RadioMenu`](@ref) and
+[`REPL.TerminalMenus.MultiSelectMenu`](@ref).
+"""
 module TerminalMenus
 
 terminal = nothing  # The user terminal
@@ -25,6 +32,9 @@ export
     Pager,
     request
 
+public Config, config, MultiSelectConfig
+public pick, cancel, writeline, options, numoptions, selected, header, keypress
+
 # TODO: remove in Julia 2.0
 # While not exported, AbstractMenu documented these as an extension interface
 @deprecate printMenu printmenu