Fix typo on ruby_ui:install output

Signed-off-by: Rubén González <2051199+rbngzlv@users.noreply.github.com>

Author: rbngzlv

lib/generators/ruby_ui/install/install_generator.rb

@@ -30,7 +30,7 @@ def install_tailwind_merge
         if gem_installed?("tailwind_merge")
           say "tailwind_merge is already installed", :green
         else
-          say "Adding phlex-rails to Gemfile"
+          say "Adding tailwind_merge to Gemfile"
           run %(bundle add tailwind_merge)
         end
       end