add auto to gacp

doc/profile.conf.example

@@ -87,6 +87,10 @@ TERM=xterm-256color
 # Prefix used by gwip when generating automatic checkpoint messages.
 #GIT_WIP_PREFIX=wip
 
+# gacp: Automatically add all modified files (git add -A) when no explicit file
+# list is provided. Set to 0 to require explicit file paths or the -a flag.
+#GIT_GACP_AUTO_ADD=1
+
 # ==============================================================================
 [info]
 # meteo: Default city when no argument is given. Leave unset to require an